Top Definition
When semen is allowed to dry and harden inside the ass after anal intercourse, gluing the orifice shut and forming a seal.

Stands for "Jizz in the Butt" Weld
I had sex with this girl the other day. But she was being a total bitch, so I JB welded her ass shut.
by BCracecar December 15, 2012
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.