Definition of "cocksuck"

cocksuck¹

noun
plural cocksucks
1. (vulgar, colloquial, derogatory) Short for cocksucker (“annoying or objectionable person”).
  Quotations
  He turned and was about to say more but by then Velva was lunging at him, bawling, "Keep outta there, you cocksuck!"
  1994, Tom Kakonis, Shadow Counter, page 139

cocksuck²

verb
third-person singular simple present cocksucks, present participle cocksucking, simple past and past participle cocksucked
1. (slang, vulgar, uncommon) To perform fellatio.