The act of sitting balls naked on the toilet while taking a shit and swigging some fine beer. Designated "Swiss" for the exquisite cocoa products comin' out yer bungbungbung.
GIRL: "Where's Francis? We gotta get to the concert?"
GUY: "Bastard's still at home havin' himself a Swiss dunk."
GIRL: "Ewwwwww... what kinda beer does he drink?"
GUY: "A lot of German beers."
GIRL: "That would figure. Now every time I see a German beer, I'm going to think of sloppy, drunk asshole."