obsessive shipper
Derogatory internet slang for someone who is overly obsessed with a particular romantic pairing (カップリング) in fandom, often pushing it aggressively or ignoring other interpretations.
See also: カップリング
That obsessive shipper won't accept any pairing other than their favorite.
カプ厨同士の争いがSNSでよく見られる。
Fights between obsessive shippers are often seen on social media.
Derived from カップリング (coupling) + 厨 (derogatory suffix for an obsessive person). The exact origin is uncertain, but it emerged in Japanese online fandom communities.