An occasion where two people are drinking strong alcoholic beverages, the two individuals must drink quickly, yet at the same speed. The Power Session ends when the two individuals are no longer capable of drinking more alcohol.
I was sitting at the bar the other night and these two guys were having a Power Session.
To glass (verb); means to be targeted by a nuclear/thermonuclear/atomic bomb.
John: London needs to be glassed dude
Daniel: Yea man, that place is evil.