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Covertly ntering your partner from behind while under the guise of doing it doggy-style. As soon as he.she relaxes, screaming "Look out-Big Bird!" and vomiting on his/her head. Also can be used to describe having anal sex with multiple partners in a train fashion when vomiting on the person in front of you when one person yells "Look out! Big Bird".
Kevin had a bunch of circus midgets over at his trailer last night and they all Machaned - it was a mess.
by Chris P November 26, 2004
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Machans is an extended slang version of the word "macha". It is technically used to address a friend in the "yo-est" and the "coolest" possible manner.

A person who actually addresses you as a "Machans". is usually black and dyslexic and owns a Jetta.

He is a person who, on listening to Heavyweight, accelerates from 15kmph to 150 kmph in 1/10th of a second.
" Yo, Machans. I got my new Jettas.. "
by CoolSahil September 29, 2011
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a Mandy that is an anime freak without the cosplay. Gernerally shy, Ma-chans tend to avoid large crowds and loud noises.
Look at that Ma-chan in the corner. She's got that weird hat and is reading one of those manga things.
by Aerianis January 04, 2009
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