Short for "needle up the butt." The act of attaching a drug and/or AIDS-infected syringe to one's penis, and then penetrating another anally with it.
"Heard he got the bug."
"How'd it happen?"
"Word is, he got nubbed...in the butt."
"Dude, that's redundant. Nub already imples 'in the butt.'"
"I know, but it's fun to say it that way."
"...Fair enough."
"You've just been nub'd...by Ashton Kutcher!"
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