|Synonyms:||Name Smoosh, Smushname, Fansmush|
|See also:||Pairing Name|
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For example, Justin Timberlake/Chris Kirkpatrick becomes Timbertrick, and Clark/Lex becomes Clex, while the pairing of Chloe Sullivan and Lex Luthor, in contrast, was known as Chlex. No particular convention other than euphony regulates how the names are combined.
Well, okay, euphony and hilarity. Some portmanteaus are intentionally funny, such as "Pepperony" for Iron Man pairing Pepper/Tony. Likewise, Minim_Calibre coined the name-squish "Spred" for Spike/Fred on Angel, and dubbed her archive for same "The Buttery," thus demonstrating that name-smooshes are mocked as often as they are found in ordinary use.
In rarer cases, a portmanteau may also include words other than the names of two characters, for example "Wincest" in the Supernatural fandom. The name combines "Winchester" with "incest" to refer to shipping the Winchester brothers together.
Popslash is credited with popularizing the smushname as pairing name. It spread to other fandoms (Buffy, Smallville, Harry Potter, etc.), though only in the age of Tumblr has the smushname taken over completely.
As pet peeve
Fans are divided on the use of smooshed pairing names. Some have fun coming up with them and like the shorthand, while others find them grating. Portmanteaus can lead to silly or unfortunate creations like Spirk and Kock, for Kirk/Spock.
Many other terms in fandom are actually portmanteaus, such as drawble for "drawing drabble", or fanon for "fannish canon", but when a fan says they hate portmanteaus, they generally only mean the infamous portmanteaus-as-pairing-names.
In Japanese Fandoms
Ships in Japanese fandoms are also sometimes smooshed, though such combinations generally follow more of a set pattern than in Western fandom. Written Japanese uses morae (syllables) rather than individual letters, and it is common in Japanese to create portmanteaus (or abbreviate words) by reducing longer phrases to three or four syllables. Pairing names follow the same linguistic rules; therefore, Japanese-fandom pairing names are generally four syllables, two each from the beginning of each name. For example, Inui x Kaidou becomes InuKai and Tezuka x Ryouma becomes TezuRyo(u) (the final u is often omitted in romanisation). Unlike in Western fandoms, such pairing names are usually written with each half capitalized, e.g. Sasuke x Naruto is SasuNaru, rather than Sasunaru.
As the majority of English-speaking Japanese-canon fans do not know Japanese, they may use this naming style without fully understanding the rules behind it. Thus the occasional appearance of pairing smooshes more akin to Western styles, that don't conform to the rules of Japanese, such as Tai(chi)/Sora, a popular het pairing in Digimon; this is often written in English-language fandom as Taiora, a combination that is impossible in Japanese.
On fannish tumblrs, portmanteaus are widely used, such as #Cherik for Charles/Erik, or #CroWen for Cristina Yang/Owen Hunt; Tumblr does not support the "/" symbol in tags. Posts must be tagged in order to be widely seen, so portmanteaus are more of a necessity. The end result is that smushnames are ubiquitous in fandoms that started (or were rebooted) after Tumblr, but are less common or less dominant in older fandoms. Older fandoms that also have a presence on Tumblr are less likely to have smushnames.
In recent years, gossip magazines and blogs have picked up the trend, perhaps from Soap Opera fandom, and started giving real life celebrity supercouples their own pairing-smoosh names. Some examples would be Bennifer (Ben Affleck and Jennifer Lopez), TomKat (Tom Cruise and Katie Holmes), and Brangelina (Brad Pitt and Angelina Jolie). The supercouple smoosh name trend became so prevalent that Stephen Colbert parodied it on the Colbert Report by citing his favorite celebrity pairing name, "Filliam H. Muffman" (Felicity Huffman and William H. Macy). 
- A Linguist Explains the Grammar of Shipping at The Toast
- "The Fandom Pairing Name: Blends and the Phonology-Orthography Interface" by Cara DiGirolamo, 2012