Chick 1: didn't know billy is a NJB until his gf told me.
Chick 2: whaaaa? no wonder he's always in joggers to cover that up.
Chick 2: whaaaa? no wonder he's always in joggers to cover that up.
by sepiacougar May 14, 2015
Get the NJBmug. A psycholohical disorder where by one brother (typically the second or middle child,) feels he has to fuck every girlfriend his older brother has. In some cases resulting in a baby.
by Wrong Monster  November 20, 2020
Get the njbmug. 