One who dresses like a tramp, food stains down t shirt, ripped old smelly dirty trainers, stale jeans, and untidy hair. Also can used to describe someone after doing a dirty (horrible) act.
' I got up this morning after going to bed with my clothes on and went to the shops, i looked like a fucking skeg'
'Did you see that nasty bitch drop her food on the floor then pick it up and eat it, the dirty skeg!'
Popular term in the State of Western Australia referring to teenagers, in particular, who wear ultra baggy/loose jeans with some of their underwear showing (why the hell we ask!?) and a t-shirt that's a bit too small. either that or an equally baggy jumper/sweater. The key thing is they skate. Generally loners too.