otherwise known as session- When two or more participants smoke a shit load of weed over a certain period of time, always resulting in each and every one of the smokers being extremely stoned.
"alright mate, that was a fat sesh we had last night, must have smoked at least an ounce"
"yeah man! I still feel battered now!"
"you got any skins?"
"nice one, i've got a jiggy on me now"