Regulan blood worm
From: Star Trek: The Original Series
Caption: Regulan Blood Worm.
Origin: unspecified. This amorphous, pulpous creature rates such a low status to the Klingon people, that name is used to insult people who are thought to be weak. The Klingon, Korax uses this term to insult the U.S.S. Enterprise at Deep Space Station K-7 in 2267.