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This is an action designed to get a bartenders attention in a crowded bar if you are not particularly good looking or well endowed. This action is accomplished by holding your empty glass to your forehead. The action is sometimes accompanied by shouting "BEER FLAG !" and is quite effective.
WOW ! You pulled that bartender right away from that hotty when you flew that beer flag.

Watch my beer flag get us refills moi ponto.
by CritterGetter March 21, 2008