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When one fails to finish, be it drinking, smoking, running, eating....etc etc. More generic term than 'light-weight'. Can be used in almost any situation where someone fails! Is also used when one vomits.
Come on Ant you halfsesh, cant believe you cant finish that drink. No NO! stop puking you f***ing HALFSESH!
halfsesh by N_Tag July 28, 2004
Related Words

Half-sesh 

The term used if a person shits out of something, goes home early on a night out, or basically stops doing something that in all situations should be done with ease.
E.g.
A person goes home from a night out really early
"You propa half-seshed it last night didnt you, went home early"

And

"Are you coming on the new oblivion ride at alton towers?" "No" "You Half-sesh"
Half-sesh by rego_jacko March 31, 2009

Half Sesh 

a person who can't handle his drink
"Oi, Keano, you're a pua Half Sesh"
Half Sesh by pualad March 2, 2013