Top definition
When you masturbate for so long there is blood from chaffing, by the time you ejaculate the semen will be mixed with blood.
Dude I was masturbating for so long last night I gave myself a rainbow wank.
by bunkbuddies May 09, 2010
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2
Where a group of Multicultral people wank each other off (in a whole group)
by Bitch man August 06, 2006
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3
When you kneel on the floor, pants down, cock in hand, then lay out all your favourite porn mags on your preferred climax pages in a rainbow shape around you and then have a wank.
My Mum walked in on me having a rainbow wank last night! I couldn't hide the porn mags quick enough.
by Wet Wet Wet Wet August 19, 2010
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