1 definition by Mr.pecker

A nan is someone who is an inconsiderate retard who seems to have to idea what he is doing or what he strives to be doing. This word is not to be confused with its second tier variation, dirty nan,which is a way to show how somebody is practically a completely asshole.
Jack refused to share his lunchables with me. What a nan.

Jack slapped me for calling his sister hot. He is truly a dirty nan.
by Mr.pecker October 6, 2015
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