A term referring to the tiny size of a man's penis. The penis must be circumstised and small (1inch long unerect) in order to resemble that of an acorn.
Barry: So, did you get laid last night?
Larry: Hell yeh, but the guy tried to fuck me up the arse with his acorn dick so I slapped him down and told him to bend over for my big sclong
Acorn dicking describes the occasion in which a person decides to go on a spree of using chipmunks and/or squirrels as pocket pussies. After the act is done, the human proceeds to chuck or punt the tree critter as far as it may go.
“Hey chuck, wanna go acorn dicking today??”
“Ooowiee Chester that sounds like a bright idea for this kinda day”