Verb: Australian. To pull down someone's daks to around the knee for the purpose of playful public humiliation.
Dave was skivving in front of some ladies, so four matesran over and dakked him.
By Dore
Dak
DAK means "Deautsche Afrika Korps". It's the german army in north Africa during world war II (1941 - 43). Probaly most famous man in it was Feldmarschall Erwin Rommel.
A subtle way of calling a trashy person. These are the trash of the party-- very likely the uninvitedtownies who crash a random party and spread their dak-ness.
Jared: Oh god, Mary-Jo and her friends showed up at the party
Sarah: Oh wow, what a dak!