sesh

Short definition from Wiktionary

Noun

1. 1
   A session: A period of time spent engaged in some group activity.
2. 2
   A session: An informal social get-together or meeting to perform a group activity.
3. 3
   A session: A period of sustained social drinking or recreational drug taking.
4. 4
   A session: A period of sustained cannabis smoking.

Verb

1. 1
   To take part in a period of sustained cannabis smoking.