Theoretically..

The tip of a males genetalia.

Can also mean:

Dumb, Idiot All sort's

E.g: I spent $100.00 on this bottle of beer.. "You Nob end"
by Kierts March 20, 2006
Get a nob end mug for your girlfriend Jovana.
dude1: dude2, you're a right nob-end
dude2: yes, I know (whimper)
by Carnophage December 15, 2004
Get a nob-end mug for your dog Beatrix.