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A derogatory term for a promiscuous bloke/lad whose only ability is that of ejaculating.

Quite often completely docile, Geyzers are incapable of conversations that steer away from their central cause in life, ejaculating again and again in whoever and whatever is around.
Richie's been a proper Geyzer since he started taking them pills. He said once he's come, he has to come again and again.....
by Benncm February 11, 2011
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