Noun. The act of masturbation performed in a work-like environment. A waller will usually take place on a break to pass the time in an otherwise uninteresting day; the prospect of getting caught, coupled with a possible lack of sexual stimulus (depending on your job) make for a challenging yet satisfying activity.
"I heard Jacob had a waller in the WHSmiths toilets."
by Steven J. Gould September 06, 2012
One who casually leans against a wall waiting for their next trick or pimp. This person is usually new to the game and only gives it out to Caucasians. Added they give massive amounts of hand and blowjobs for a meager ten dollars a job.
She's been leaning against that aparment building for an hour she must be a Waller.
by Someguyyouhate June 14, 2011