Top Definition
(Australian slang) The act of pulling someone's pants or shorts down when they least suspect it, usually by sneaking up behind. Intended to cause maximum embarrassment, particularly if the "double dacking" is deployed, which also removes the underwear, exposing genitals.

A typical form of humiliation or payback in school yards in Australia.
Young Steve was talking with a group of sheilas he wouldn't mind having a crack at one day.

Suddenly, Dave emerges from behind and gives Steve a dacking.

Steve: Oi fkn *frantically grabs at pants*
Girls: *titter*

Steve taken down a peg or two in school yard
by hoomuzu March 11, 2016
Messing around, doing nothing in particular, or hanging out; a de-evolved derm for "dicking around."
"Hey, what're you up to?"

"Eh, nuthin much, just dacking."
by jmplowe August 23, 2011
To smack one's penis against a female's face during sexual intercourse. Compound word comprised of Dick and Smacking.
"The chick I was with got a good dacking after I got done having sex with her."
by Chris Ohlsen December 29, 2006

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