a group of people smoking up

A group of people smoking marijuana together, in the "pass it around" sense.

To consume large quantities of alcohol - typically with a group of friends - with the intention of getting drunk.

To practice breakdancing.

Could also be used as a noun to describe the amount of weed you have grinded up for a particuclar smoking occasion (could also be called a session)

Can be either planned or not, if planned it is a period of time spent inside a liscensed premesis where the sole primary activity is to consume alcohol, most commonly beer. A session can also spontaneuosly occur from a swifty, when the killer phrase "fancy staying for another" is uttered.A session has no set time limits, but is mainly governed by alcohol tolerancy, kung-fu money, opening hours or a combination of the above. A session has no limits to participants, but any more than can fit round one table could be problematic. A solo sesison would only be considered for an alcoholic.Popular sustinence when in a session would be a range of bar snacks, such as crisps, pork scratchlings, or pub grub. When sessioning with freinds, purchasing drinks in rounds is a socially convienient method if not financially. A session is a truly British thing that can only truly be experienced in a british pub since I am yet to experience the warmth and atmosphere in foriegn pubs that would invite you to stay for longer.
Can also be known as a gary player/leo sayer cockney rhyming slang for all dayer

a period of time during which a group of bboys meet to practice their moves and battle one another.

May be done by themselves.