Skidknocker 

A person who dislikes Skids (greasy/poser metalheads).
Someone who truly believes in metal who knocks around a Skid for disgracing it.

That dumb shit called me a Skidknocker just because I roughed up that poser the other day.

Skidknocker by assistedsuicidex March 28, 2011

shitknocker 

shitknocker has the same meaning as fartknocker except a little more vulgar when you want to be a little more vulgar where youre not worried about using your manners

dude you owe me money shitknocker

man this shitknocker dont owe you money

dude youre such a shitknocker

shitknocker by littlejimmie March 9, 2019

Shitknockers

Expletive used to show dismay, anger or contempt. Similar in use to “fuck” but a less severe expression.

"Oh, dude, you have just run over that cat!"
"Shitknockers I think that was my Neighbours"
" Oh shit, you will have to go and tell them"

Shitknockers by acl551 June 7, 2009

slipknocker 

idiot, moron. derived from "cockknocker"

what did you screw up now, slipknocker?

slipknocker by Mike G October 12, 2004