What is Machan?
1.
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.
2.
comes from Sri-Lankan slang. It means buddy.
ayy machan what u sayin?
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3.
means friend or buddy
comes from Sinhalese Slang, official language of Sri Lanka
wht are you saying machan?
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1. 
noun
A physical appearence of a person with a huge head and a tall skinny body. He/she looks like a penis.
Bob keeps eating and growin.. 
1. 
The badest mother fucker on the planet without a doubt. Bad ass enough to have your own G.I Joe and blow up a tank with one shot. Is the..