To geek is to laugh or to have a quick feeling of amusement. A geek sesh happens when one or more persons (usually friends) are geeking for extended periods of time.
Man: Dude I was just geeking all last period
Friend: Sounds like you had a major "geek sesh" man
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v. To flake out on your friends at the last minute.
We were planning on going on the trip with the squad but Ben had to Dib again.