Abbreviation of mantra snakes on a plane, approx meaning "what ya gonna do" or "c'est la vie". Can also be said as "s on a p". Usually accompanied with a shrug of the shoulders.
Guy 1 "I can't believe that shit happened to you dude"
Guy 2 "S on a P man, S on a mothafuckin P"
Guy 1 "sonap"
by Phil Sarson April 15, 2007
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