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1.
A shock induced by butt sex. Usually after long periods of butt sex, or short periods of surprise butt sex.
Tom: What happened to Ted.

Bill: He had a buttshock!
by matacoz April 11, 2009
 
2.
When someone is naked and another passes behind them and blows a concentrated stream of air up the naked person's ass hole without them expecting it.
I totally butt shocked him when he was sleeping.
by johnjanedoewhatevs December 19, 2010