A common british term for when your things rub together frequently and cause sores and a very bad rash, and in bad cases cause bleeding. (This usually happens to people with big/thick thighs hence the name 'Chub' most commonly occurs at the beach with sand or if there are tears in their pants where the things meet)
Damnit i got some serious Chub-Rub
*sees red thighs* Jesus thats some bad Chub-Rub!
Chub Rub is the body lubricant that is necessary for engorged and furry runners and hikers have to coat their bodies in during the summer. Chub Rub keeps chaffing and blisters to a minimum.
Hey, I'm going for a run; can I borrow your chub rub so that I stay moist and don't chafe.