A young guy who has no power in the world except the power to annoy.
So he (and his mates) dress and walk like wannabe gangstas, and do things like cross the road super-slow in front of your car forcing you to slow right down, because they know you aren't going to run them over. As they walk by they look at you sullenly.
Punkasses need to get the beatdown as soon as possible so they become plain punks.
'Look at that fucking punkass. Why is he walking like one leg is shorter than the other!? Fucking loser.'
Australian. White Ants is a term for termites, who eat out th foundations of your home. A mate who undermines your chances of scoring with a chick, or achieving something else is said to be white-anting you.
'I was in with that chick until that fucking cock-blocker white-anted me.
Australian (maybe Queensland). To make a fist with one hand, making sure your middle knuckle is protruding. Then go up behind someone and rap them hard over the back of the head with the extended knuckle.
Painful and surprising. Mostly done by jocks and thugs on dorkwads and Warcraft players.