An alternative obscenity to express just about anything you desire.
Oh my Guck! What the Guck was he wearing? I Gucked up last night. Oh my Guckness! Son of a Guck. Why don't you go Guck yourself!
You like watching your gay partner get fucked so you're a guck
Derogatory Someone who cuts themselves / self-harms. A cutter.
Sam: Yo Kyle, care to explain the bloody razor blade I found in your bathroom?
Kyle: Oh, that? I swear, I was just playing with a red candle!
Sam: Kyle, don't be a guck. I've seen the scars on your inner arm.