1. v. when you are playing mario kart and some dick decides to send you a blue shell, which flies towards you and smashes you in a huge explosion. It is extremely frustrating.

2. v. to get fucked over, screwed over, stabbed in the back, owned, ect. However, do not use this meaning unless your friends play mario kart because people will not know what you are talking about and will probably think you're a nerd.

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)

A cursed item in Mario Kart made by satan himself that targets you in first place, possibly ruining your race and friendships; Hell in the form of a Mario Kart item

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.

Your Playing Mario kart right you are ahead of everyone doing perfect and then you see it coming the blue shell you scream "OH SHIT!!" it hits you it's over you go from 1st to 12th in 10 seconds and lose the race it's the Mario kart item from hell

Originated from Mario Kart Wii; where the player in first has such a huge lead, they would hold on to it even if hit by a blue shell or 2.
Generally means that the one in first has an obnoxiously enormous lead.

Named for the "blue shell" in Super Mario Kart games. A politician who creates a policy whose purpose is to slow down or eliminate those who have gotten ahead in society. The effect is to eliminate the current leaders and replace them with a new leader.