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2.
The act of caressing the ass of an unsuspecting victim.
Most often witnessed in subways. An acceptable but lesser used version can be used to describe rubbing ones own ass in a public place thereby making others feel uncomfortable.

(eg Spunking used to be my favorite hobby until I found out that all the times I've been maced can cause blindess)
by Mike Teri November 08, 2007
 
1.
Spunking or Cum kiss A kiss where you share the cum, in or off your partner's mouth or lips
Spunking: A kiss where you share the cum, (semen or pussy juices) in or off your partner's or partners mouth and/or lips sometimes known as a Cum Kiss
by ToyBare January 02, 2010