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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
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Chub Dubs! 

1. When an over weight male or female does something good in gym collapses to the floor as if there were an earthquake
2. A chubby female who smells like ball cheese because she doesn't shower
3. A chubby male who is scared to talk to the teacher because he thinks he will shart in front of her monstrous balder sack
Gary: Do you smell that?
Danny: Oh yea, Its Chub Dubs!
Chub Dubs! by ZentonicleYT.com January 15, 2020

scrub chub 

When you can see a man's jewels through his scrubs due to his enourmous cock and balls or when a man in scrubs is suddenly overwhelmed with an erection which can be seen through his scrubs.
"Did you see Bob's scrub chub today, Sue?"

"Yes, and he is quite endowed! Is he single, Jan?"
scrub chub by mrs.dds March 2, 2010
1. a male erection.
2. to pop a boner.
3. to get long and hard.
I popped a chub when she got on top of me.
chub by ricorico January 15, 2006
The act of masturbating using ones own excrement for lubrication. Often performed (But not limmited to) on a toilet or in a shower.
1. The filthy bastard was pulling a chabs in my living room.

2. Go chabs yourself dickhead.
chabs by Jack Star December 13, 2006
When you get so fat your penis resembles a tuna can.
"That Eric Soto is so fat he must be rocken a chuba!"
Chubba by Rick James February 18, 2004

chub scout 

A physical reaction that occurs when a man is looking at a woman and finds her to be attractive. Because of this fact, he penis begins to get a little erect, or he has a "chub scout"
-tune of Copo Cabana.
"Chub scout,
she gives me chub scout..."
chub scout by Kasdun September 18, 2007