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
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dude1: dude2, you're a right nob-end
dude2: yes, I know (whimper)
by Carnophage December 15, 2004
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