1 definition by rasterbator1

The action of masturbation while wearing a Rastafarian hat (preferably with dreadlocks) and smoking large sums of marijuana. Generally those who partake in this activity shout "yaman" at the moment of ejaculation.
Fred: "Hey, you guys wanna have a huge rasterbation session tonight?"
Tad: "You know it!"
by rasterbator1 July 8, 2009
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