When you're coming late to a party and one of you're friends who has been there earlier tells you to catch up drinking because he or she is a couple of drinks ahead.
In fact, this isn't true and he or she just wants that you're getting drunk.
Sarah:"Hey guys you have to get some shots. I'm way ahead of you!"

Stephan:"Looks like Sarah has been ghost drinking the whole evening..."
by john mf kimble January 5, 2012
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