The action of cheating where you are the individual with whom a person in a relationship is cheating.

or

The action of cheating in which you are not in a relationship, but the person with whom you're fratternizing with, is.
AKA = the other man or the other woman

Monika Lewinsky addered with Bill Clinton.
by Josh and Crispo October 20, 2004
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Administrators n shit...
an adder just joined the game
the adders joined the game
by 33ts May 25, 2020
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"I'll never lend Steve my jazz-mags again. When he gave them back all the best pages were covered in bladder adder snot. The twat."
by Milton J. Cummingsworth July 20, 2008
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