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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.
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

Popping a Chubby on the D-floor 

The act of gaining up to 3/4 of an erection whilst suggestively dancing with a partner on a dancefloor.
-The day after Popping a Chubby on the D-floor-

Patrick: Hey dude how was clubbing last night?

Guy: Not bad, I popped several chubbies on the D-floor.

Patrick: Solid.

get a chubby on 

1. The happy free-spirited state of a newly erect penis.

2. To be annoyed with someone or something.

3. Not to be confused with " to get a chubby ONE " that refers to pairing up for the evening with a larger lady/ gentleman.
1. "I'm not bothering to come out tonight Katerina, I'm gonna stay home and watch 3D cartoon Incest porn and get a chubby on".

2. "Those girls in the accounts Dept really are getting me a chubby on "

3. "I've had enough of skinny women for now , it's like fucking a wish bone. I'm gonna get me a chubby one tonight "
get a chubby on by Burning blue soul February 22, 2017
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