Term commonly used in the Maritime provinces of Canada to describe the male genitals in a state of semi-arousal. Generally occurs as a pre-cursor to a full-out hard on, or after ejaculation, when you're hanging long and lazy.
guy 1: Dude, that shootergirl's fuckin hot!
guy 2: Yeah man, I've already got a chub on... if she comes any closer I'm gonna get a hard on
guy 1: Already there man.