RhymeZone: coomer definitions

Definitions of Coomer:

name: A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #7039)

noun: A surname.
noun: (Internet slang, vulgar, derogatory or humorous) A man who is addicted to masturbation; by extension, anyone who is excessively horny.

(Definitions from Wiktionary)