Fandom slang for pairing characters in a romantic relationship, especially in fan fiction, manga, and anime contexts. Abbreviation of カップリング.
See also: カップリング
このカプが一番好きです。
This pairing is my favorite.
SNSで人気のカプを語り合う。
Discuss popular ships on social media.
capric acid; decanoic acid
Clipped from カップリング (coupling), which is borrowed from English 'coupling'. The abbreviation is common in Japanese fandom slang.