Top definition
a person who gets totally wasted usually a lightweight. A Betsi will pass out and will make everybody worried.
dude: fuck what happened to her.
Dude 2: she drank more then she can handle...
Dude: how much did she drink?
Dude 2: 1 shot
Dude: shit its a betsi
by Frisco Moreno July 31, 2011
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