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Short for "sunday session". The act of getting together on a Sunday to socialise and drink likely large amounts of alchohol.
"I know we've been out Friday and Saturday, but fancy coming down to the pub for a Sunday sesh?!".

"On my way."
by forthelose April 29, 2010
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The act of waking up on a Sunday morning, smoking some weed, and then chilling and enjoying yourself.

Any very relaxed, laid back seshes that take place in the daytime. May come on the tail end of a really crazy night.
A: How was your weekend? I heard about the party on Saturday...

B: Yeah it was lame as fuck, it got broken up after like a hour. I did crack a Sunday Sesh the day after though, which was pretty chill.
by Philcifer June 17, 2008
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