1. I forgot my homework so my teacher knacked me.
2. I hit my hand off the wall and it knacked(If it's hurting at the time you say it is "knacks").
2. I hit my hand off the wall and it knacked(If it's hurting at the time you say it is "knacks").
by Clive Warren March 19, 2009
It basically means disgusting or minging. If an orange has gone all green with puss and stuff that would be deemed as gammy
by Clive Warren January 12, 2009