Top Definition
to smoke marijuana in an allotted time and shortly after lighting the THC goes into the blood stream and to the brain releasing the serotonin causing you to laugh, usually out loud.

sesh- AKA SESSION. so, GRIN SESH = GRIN SESSION
DUDE, GRIN SESH ASAP
by GJackk * & D.Dashh * March 01, 2011
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