We don't have any synonyms for sesh yet.
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Definition of sesh:
(n) :
(colloquial) A period of time spent engaged in some group activity.
(n) :
(colloquial) An informal social get-together or meeting to perform a group activity.
(n) :
(colloquial) A session.
(n) :
(UK, Ireland, informal) A period of sustained social drinking or recreational drug taking.
(n) :
(Australia, Canada, US, informal) A period of sustained cannabis smoking.
(v) :
(colloquial, intransitive) To take part in a period of sustained cannabis smoking.