Top Definition
Stands for: Jerk/Bastard Revealing To Males (under) 18

A term used to describe a male who reveals himself to other males who are under the age of 18. This person is typically a homosexual pedophile.
"Did you hear about John? He's in prison cause they found out he was a JBRTM18"
by Drake Failsauce June 22, 2009
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