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1.
to hang out and do nothing, this may or may not include a nap, and may or may not include an ice cold natty.
Bro, you tryin' to get in on this blaith session?
by The Blaithmeister December 16, 2009
 
2.
A slang term used in various forms to describe something as terrible. Commonly used as a derogatory remark against someone when they're being highly tedious and/or annoying.
Guy 1: "Oh man, this Sex On The Beach is so tasty and the umbrella really compliments my hair colour"

Guy 2: "Dude, you're so blaith right now, it hurts."
by Reagansmash1994 November 23, 2012