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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.
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A semi-errect penis, as in the several phases of penile arousal. Eg. 1) Flacid 2) Fluffed 3) Chub on 4) Errect 5) Throbbing 6) Ejaculating
Many healthy males get an errection every time they ride the bus or train. As the destination quickly approaches, it is normal for a male with an errection to experience sensations of fear and/or panic in foresight of being observed by others. This can cause the release of epinephrine into nervous system which can thicken the blood and cause an errect penis' blood flow to diminish, leaving him with a chub on. In some cases, a release of epinephrine can stimulate or excite a male further, causing the penis to become "harder". In this case, a male may voluntarily skip their destination to allow the swelling to reduce, or they may tuck in their errect penis' into their pants' waste line to avoid other passengers suspicions'.
Chub on by edraculate August 17, 2016
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.
Chub-on by Z. Tenao December 6, 2011

Chub On The Buff 

When a male is built like a football player but has just a little bit of extra baggage.
"That guy is so chub on the buff."
"Yeah, he's really fit, but he's got a bit of cushion for the pushin."
Chub On The Buff by CC: Alive89 November 24, 2006

chub on my nuts 

1. To gnaw, chew, or nibble on someone's testicles; 2. To place testicles in mouth and gently suck while making a sound similar to mastication; 3. To rub against the testicles.
Dude, you're being an idiot right now. Just chub on my nuts.
chub on my nuts by MJ January 15, 2004

Chub on Chub discrimination

Chub on chub discrimination is when a chubby person discriminates another chubby person for being chubby
Did you hear kevin make fun betty for being fat when he fat

That's chub on Chub discrimination

Full-on Pata-chub 

A massive, throbbing chub brought on by experiencing Patagonia with any of the five senses.
Ben linked me to the M's Capilene 4 Expedition Weight 1/4-Zip Hoody; I was instantly at full-on Pata-chub.
Full-on Pata-chub by 1LSLS January 15, 2013