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1.
When one receives/gives a hand job under an airline blanket mid-flight.
Jenny gave me a snake on a plane on our way from Dallas to Vail. I blew my venom at 20,000 feet.
by grrr22 January 09, 2012
 
2.
Snake on a Plane is a piece of high quality hash that has been worked into a long skinny length and then rolled inside a fat joint.
I smoked a snake on a plane by myself and I was still flying when I woke up the next morning.
by ganjru May 03, 2008