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From Mario Kart, a Nintendo game.

Whenever you get ahead and think you have it made, someone behind you shoots a blue shell at you and takes you out.

(Blue shells fly directly to the person in first place and pack the biggest punch in the game)
I was doing great at my new job then I was blue shelled. (fired)
by Toadster March 10, 2004
104 12
When a guy and a girl are having sex and the girl thinks the guy is going to finish too early, she smacks him hard on the balls so that she can finish first.
Sam: I was so close to finishing last night with Diane but then she totally blue shelled me and now I'm walking funny.
by Pow! Right in the kisser! December 13, 2010
22 39