Red Shelled
When you're going down on a girl, and when you really start to enjoy it, she has her period. It's like being in first place in Mario kart, until someone uses a red shell.
It was going so good last night, until she red shelled me
dropped a red shell
To fart when someone is walking closely behind.
Oh man, i was walking up the stairs and i dropped a red shell on steve, hee was sick in the bin. wtf! hahaha