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1.
A nasty girl (ie. busted face, bloated midriff etc...) who goes to parties, waits till normally self-respecting guys get drunk, and attempts to hook up with them.
Oh dude, watch out for karen, she's a KEG TROLL and she's on the prowl!
by rick March 28, 2005
 
2.
Nasty girl who waits at parties till everyone is drunk then she will get with them.
Nick's sister was a totally kegtroll last night at the party.
by austin Heron April 21, 2006