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2.
really cool, as in very cool, hip or trendy
those are some sikk shoes dave, those are the new jordans right?
by raeon cunningham August 18, 2005
 
1.
Used to describe something awesome. The more k's at the end, the more awesome it is.
"Yeah that song is pretty sikk"
"OMFG!!1111 Did you see that sikkkkkkkkk wheelie?"
by Bun1t May 28, 2006
 
3.
Amazing, great, awesome.
The concert was sikk last night.
by Haunttt he January 19, 2012