Someone who is so annoying that they must suck dick for a living. Does not imply Gayhood. Merely a modifyer for how annoying someone is.

For instance, Dirk Diggler from Boogie Nights.
He is not gay but finds himself at the business end of a cock.
His foolish drug-addled behavior gets him into the trouble that turns him into a cocksucker. Hence, he is being a Pecker Lips Bitch.