The normal reaction to listen to a nub talking shit: A back-handing type gesture, where the back of the right hand is forced into the palm of the other, making a loud slapping noise. (This is referred to as a Nubslap).
The Nubslap is the only known way to keep a nub in line.
Nub: Hey mon, we should go to the dollar store and buy a bunch of Windex!
Person: What? Why?
(Nub maintains a shiteating grin while shrugging shoulders)
(Person performs a Nubslap)
Person: Fucking nub.