What is Mattress Pumper?
1.
A young guy, shy, loner, usually a teenager, often a geek, who does not have a girlfriend and spends far too much time alone, often at home in his bedroom, when other people his age are out having a good time. The implication being that he is
An underage drinker (under 18) is in a bar and bumps, into a grown man who shouts at him, "Piss off, you little mattress pumper".
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1.
Potentially, any one of the numerous corporate sandwich shops that have sprung up in the past few years throughout America's cities..
