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Abbreviation for eXtreme Makeout Session.

A makeout session ranging from 1st to 3rd base depending on the situation, location, or mood.

Usually planned ahead with no emotional attachment or strings attached.
Lee: Hey Cat! Wanna have an xms later?
Cat: Sure.

Cat: Heh, Lee and I had a crazzzyyyy xms last night at Kevin's party.
Amanda: Lee available tonight?
by JRizzzzzzle June 11, 2005
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