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noun. Any substance used to facilitate an erection (e.g., Viagra).
Shit, it's my wife's birthday. Hope I still got some Chub-on in the medicine cabinet.
by Z. Tenao December 06, 2011
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.
by Pervertical_line_test October 29, 2008