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Popularized by John and Hank Green, commonly known as the vlog brothers, it refers to an incident when the boys were younger where their dog pooped in John's classic Nintendo game console.

It can now be used to describe something that was once great being ruined by it's own selfishness or greed.
Girl 1: I can't believe you ex-boyfriend cheated on you.
Girl 2: Yeah, girl, it was like he was just gladly pooping in my nintendo.

Man, BP totally pooped in the Gulf's Nintendo!
by zachimus June 19, 2010
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