When you are recieving a blowjob the person giving said blowjob bites the the head and/or foreskin of the penis.
Luke: Oh damn did you hear Lacie gave Kash a chomp job?
Gesus: Oh that's weird. I kinda hope she gives me one... DON'T JUDGE ME!!
Luke: Gesus, nobody likes you.
Gesus: Yeah, I know.