Sesh is a colloquial or slang short form of session, (plural seshes), and is also a short form of seisiun, a word used by the Irish. Generally, sesh refers to a period of time spent engaged in some group activity. Increasingly, it has come to mean, particularly among young people, an informal, often impromptu, get-together or meeting to perform a ...
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http://en.wikipedia.org/wiki/Sesh
Sesh is British slang for a drinking session or bout.
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http://www.probertencyclopaedia.com/browse/ZS.HTM
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