The squinty
face that one suddenly and uncontrollably makes when the
DJ drops that sick-ass funky
track.
The faces the entire crowd makes, in unison, upon hearing that catchy, funky hook in a dance song. Sickfaces are most likely seen where House music is being played.
Oh, snap! That
track was off the
hook. I had my sickface on the whole time...
Holy shit, did you hear that track?! Everyone had their sickfaces on
man!