A Jetpack, or "jetpacking" someone, refers to another elementary school or middle school hi jinx, in the same category as a swirly or wedgie. It involves the giver to take a carbon dioxide fire extinguisher, putting the spray end down the back of someone's pants, and emptying it.
OMG, Jason totally gave Billy Bob a Jetpack after a wedgie! That's one cold, sore ass!

Holy Crap,I got jetpacked by Brian the other day and it was Friggen' Cold!
by LoganPhyve September 4, 2008
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When you get so high that you start remembering things that you haven’t thought of in years in reverse chronological order.
Jetpacking helped Randy remember the name of the girl he kissed at camp in fourth grade.
by bstujm February 23, 2020
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When someone pulls the slide of the bong a little to hard and accidently lets it go, flying arcoss the room, thus ruining a session.
Craig is an idiot. He jetpacked the bowl during our session.
by aRTie November 1, 2013
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a noun replacing purse back pack
girl1- i got a purse-back pack for christmas

girl2-so its a jetpack?
by shamrocksweetie February 27, 2009
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The act of pulling out during sex, but leaving the condom inside the woman.
Guy 1: Hey man, what'd you do last night?

Guy 2: Ah dude, I totally Jetpacked this girl then split!
by Joeee_182 January 10, 2010
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When the male is the shorter partner in the sexual encounter and is performing intercourse from the back.
"Gigi is mad short, he must jetpack on Sarah all the time."
"Oh definitely he is mad jetpacking on her."
by iJetpack December 2, 2011
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Last night really sucked. I was jetpacking Jeff the whole time.
by Gingersnap18 March 13, 2016
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