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.
1. I was playing Mario Kart and i got blue shelled, next thing i knew my Wii was in pieces and my wall was dented.
2. that bitch blue shells people for her own enjoyment, backstabs and screws people over