The Collaborative International Dictionary
cocksucker \cock"suck*er\ n. a worthless or despicable person; -- intended as disparaging and invariably offensive. [vulgar slang]
Syn: rotter, rat, skunk, stinker, bum, crumb, lowlife, scum bag, motherfucker, mother.
2. a person who performs fellatio.
Douglas Harper's Etymology Dictionary
1890s, "one who does fellatio" (especially a male homosexual); 1920s as "contemptible person," American English, from cock (n.1) in phallic sense + sucker (n.). Used curiously for aggressively obnoxious men; the ancients would have recoiled at this failure to appreciate the difference between passive and active roles; Catullus, writing of his boss, employs the useful Latin insult irrumator, which means "someone who forces others to give him oral sex," hence "one who treats people with contempt."
Wiktionary
n. (context vulgar colloquial generally pejorative English) Someone who performs fellatio.
WordNet
n. a person who performs fellatio
insulting terms of address for people who are stupid or irritating or ridiculous [syn: asshole, bastard, dickhead, shit, mother fucker, motherfucker, prick, whoreson, son of a bitch, SOB]
Usage examples of "cocksucker".
Well, since Deputy Cocksucker and the discovery of the freak show and carnival.
Whaddayamean Dean broke into one of his numerous drunken crying jags at choir practice after hearing of the ultimate fate of Clyde Percy, Roscoe Rules called him a nigger lover and said the old cocksucker probably wanted to go back to Camarillo in the first place just to molest the little dummies.
It gave Farouk intense gratification to bring the self-secure cocksucker to his knees time after time.
If hundreds of thousands of college kids across the country unite, then how can even a cocksucker like Nixon not hear us?
Pope like all these rich cunts and cocksuckers you read about, Then I coulda stayed in the church.
My father called Mulrony a Fenian cocksucker and we were black affronted in proper Broons style.
I called the guards Nazi cocksuckers or something and in order to get in the White House I had to promise not to call anybody Nazi cocksuckers.
And then I promised not to call anyone Nazi cocksuckers, and they let me in.
Now this is a class-A tip, and I deserve a reward for it, and I need some fuckin’ money to cover bets with, because bookies and shylocks with no bankroll get hurt and can’t snitch to candy-ass Fed cocksuckers like you.
I am empowered by the Los Angeles Police Department to roust those cocksuckers on general suspicion, and I'm derelict in my duty for not doing it.
I never snitch, 'cause cops are all cocksuckers who get their cookies off making guys talk.
This building's been took over for the people by the Revolutionary Peace Committee, it and nothing in it belongs to you cocksuckers anymore, see?
As these cocksuckers torture me, Butch and Caduta are forced to watch.
Failure to comply with each and every one of these proposals would result in Lorne's invocation of the Artistic Differences clause in his contract, whereby Lorne indefinitely repaired to Palm Beach at our expense 'until you cocksuckers sort this shit out.
All these cocksuckers are bound to be anti-Semites, because if they aren't, how come there are no Jews anywhere in England I've heard of, huh?