What is Custnark?
A heinus snitch.
Kyle: "Tight party"
Sahib: "Yea word"
Kyle: "Hey, what's that kid doing over there in my bag?"
Sahib: "Yea, what the fuck, what a nark"
Kyle: "And he's so ugly; a custnark yo"
See snitch, nark, cust, custy, lurk, party