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1) (verb) When you order a Big at McDonald's but it gets fucked up and you get a "Buttmak"

2) (noun) The sandwich that is given to you when McDonald's fucks up your order

3) (verb) the act of a McDonald's worker taking a dump on your Big Mac.
Tyler Manseau just got buttmak'd.
by The Akid June 23, 2009
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