To masterbate while or after smoking and being under the influence (see high) of marijuana.
Mikey Z smoked a bowl and rastabated.

Mikey Z passed out while rastabating in the bathroom.

We caught Mikey Z rastabating at the party.
by M. Zuso April 4, 2005
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Smoking the weed before partaking in the act of self abuse!
Jonny Boy Blades got so perv'd up at work he picked up an eighth and rushed off home for a spot of rastabation
by Itchy Trigger Fingers January 29, 2009
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I walked in on Weed Man Winston only to find him "rastabating"
by joshmiller November 22, 2013
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