Green’s Dictionary of Slang

1. (US) a fool, an idiot, an unpleasant person.

1989		T. Wolff This Boy’s Life 189: I was lying on my back with Huff kneeling on me, slapping my cheeks. He said, ‘Speak to me, dicklick’.
1990		S. Morgan Homeboy 24: Whaddya think this is, a whorehouse? This is a nightclub, dicklicks.
1998		J. Lansdale Rumble Tumble 102: Do what he says, dick-lick!

2. (US gay) fellatio.

1988

H. Max Gay (S)language.