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An older man, constantly whining and complaining (to anyone who will listen) about his long-lost youth. Constantly hangs around with the younger crowd and observes with resentment. This phase often precedes or coincides with midlife crisis.

Note: It is best to avoid a bitter bill in social situations, especially when alcohol is added to the mix.
"I avoid going to bars during happy hour, because at that time of day, it's usually just a bunch of bitter bills looking for young tail."
by CrackInTheBox July 15, 2005
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