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Definition 2024

sesh ‎(plural seshes)

(colloquial) A period of time spent engaged in some group activity.
(colloquial) An informal social get-together or meeting to perform a group activity.
(Britain, informal) A period of sustained social drinking.
(Australia, informal) A period of sustained cannabis smoking.

Meaning 1:

"'We're not going to win a prize for graphics,' said Syd Silverman in a sesh this week."

2005, Bruce Pegg, Brown Eyed Handsome Man: The Life and Hard Times of Chuck Berry, Routledge, page 51,

"There's no opportunity either to take rhythm & blues or leave it alone at this sesh at the Apollo."

Meaning 2:

E.g., snowboarding: "Then it was on to the wallride for a sesh where numerous tricks were thrown down." April 11, 2007, Dave Driscoll, Transworld Snowboarding Magazine.

Examples of usage in Usenet groups:

Playing video games together: "Halo sesh" (2002)
Surfing: "Went out for a quick sesh today in Huntington. Wore my spring suit." (2003)

Meaning 3:

"Empty lager bottles […] signified that Hans and Fritz also knew the joys of a desert sesh."

1999, Ian Rankin, Black and Blue, St. Martin's Press, ISBN 0312966776, page 39,

"Impulse buys one Saturday afternoon, after a lunchtime sesh in the Ox…"

Oxford English Dictionary, Second Edition, Addition Series 1993
The New Partridge Dictionary of Slang and Unconventional English, Vol. II, 2005, Eric Partridge and Dalzell Victor Eds, Published by Taylor & Francis, ISBN 041525938X, page 1699
Cassell's Dictionary of Slang, 2006, Jonathon Green, Published by Sterling Publishing Company, Inc., ISBN 0304366366, page 1252
The Dictionary of Contemporary Slang, Tony Thorne, 1990, Published by Pantheon Books, ISBN 0679737065, page 448.

From Old Spanish seis or seys ‎(“six”), possibly influenced by Hebrew שֵׁשׁ ‎(“six”).

sesh ? ‎(Latin spelling, Hebrew spelling סיש)