Wet Wet Wet Wet's definitions
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
Get the Rainbow Wankmug.