The Act of discretely recieving sexual pleasure from a jacuzzi jet by placing one's genitals in front of the jet's blast.

note - it is always a good idea to have a spotter and/or a decoy, should a lifeguard become suspicious.
"Yo last friday we wasn't gettin' no play at da club, so me and my homies rolled to the rec centre and jet jammed the fuck out dat bitch!"

"Dude, i got banned from the pool last week cause i got caught jet jamming by one of the life guards... so embarassing"
by M-Russ November 4, 2009
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