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1.
The act of printing a large image on several pieces of paper to tape together into a poster.
The image was too large for his printer, so he had to resort to rasterbation.
by MisterPD May 22, 2006
 
2.
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 07, 2009