siiiiiiiiick
A slang or reference to something being Hard Core or Cool! Mostly referred to Art, Cars, Music, or even tattoos/piercings
Guy: Hey look man I got a new tattoo
Friend #1: that is a pretty cool tattoo
Friend #2: that is Siiiiiiiiick
Friend #1: that is a pretty cool tattoo
Friend #2: that is Siiiiiiiiick