The act of buying, selling or trading girls of an equal value to your expense.
Person 1: Hey, Want to do some gasheous exchange?
Person 2: Okay then, I only have £10 and a dirty girl at the moment though.
Person 1: Thats fine, add them together and we can find you something decent.
by Brimmy April 25, 2009
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Any member of the human race, excepting those born by caesarian section.

The toxicity of the gasheous emissions varys greatly.
"After years of contemplation, Professor Hawking realised that big bang or no, we are all gasheous emissions".
by jivehoneyjive March 11, 2008
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