What is Knobbin?
1.
Knobbin someone- to be having sex with them.
Guy1: were was u last nite?
Guy2: I was knobbin my gf
2.
oral gratification for the male organ given by a female (or male)
Yo, can i get some knobbin
3.
hangin' out, relaxin
Mike: Hey Ron, what you doin'?
Ron: Not much, just knobbin around.
See
4.
A small wanker.
That knobbin hit me in the balls.