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1.
Getting hammered with a large group of friends; lots of alcohol involved typically
Here man, we're already sessioning at mine come on down! Some of the lads are already locked!
by hardcoreSessioner April 15, 2011
 
2.
To go out and own everything in your path...Sessioning is when you go explore a specific thing or place, chill, and just post/stay there.
Me: Yo G lets go sessioning, im bored.

G: Alright dude, lets session The Grand Hotel up ahead.
by Brian Owner April 28, 2007