means friend or buddy
comes from Sinhalese Slang, official language of Sri Lanka
wht are you saying machan?
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.