1. To leave a location.

2. To quickly depart from a location.

see also: jet
"I gotta get up early tomarrow so I'm about to jettison."
by El-Keter July 24, 2002
1: throwing up, puking
2: to rid your body of pretty much everything it can, usually in the form of post party vomit or shit.
"man! that made me sick, i totally had to go out back and jettison!"

"i partied so hard, i had spent an hour afterwards jettisoning everything!"
by Shinigami Dani July 18, 2003

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