by Meen June 19, 2006
When a young-looking law enforcement agent (cop, FBI, etc) goes undercover at a high school or college with the intention of blending in then busting illegal activity from the inside. Inspired by 1980s TV program 21 Jump Street starring Johnny Depp.
by ksquared85 June 24, 2012
a person who is in their 20 or 30s, yet still look and act as if they are still in their teens. based on the concept of the show 21 Jumpstreet
by jenko81 April 20, 2012
Adjective; usually used when a plan is unraveling negatively and will probably be fucked. Usually only said when high.
"This plan's been fucked since jumpstreet."
by MrJacksColon September 14, 2009