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1.
When someone shows up to a party and drinks more than he/she can handle.

Not knowing their limits, they end up puking on your lawn or in your bathroom; possibly for a prolonged period of time.
Katy: Did you see Sam last night? He thought he could down 5 shots of whisky and then turned into a total yakmeister. He was puking all over the lawn!

Steph: What a loser.

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Jagermeister to yakmeister.
by vero k. July 24, 2009
5 1
 
2.
Someone who drinks way to much,throws up multiples times, in conjecture with jagermeister. May even lock themselves out of their own room.
Stef: Sam could not handle her scandle and threw up five times last night.

Tony: She's the yakmeister !
by 9449 November 05, 2012
4 1