The act of picking one's nose and wiping the buggers in another's ear.
I was sitting behing James in Ryan's BMW, so I gave him a chunky charlie.
The act of taking a dump in your sexual partners mouth.
Guy 1: Dude, I just gave my girl a Stanley Steamer last night
Guy 2: Yeah, well my girl let me give her a chunky charlie after mexican food.
Guy 1: Lucky fucking bastard!