Bart, get out! I'm piss!

Bart, get out! I'm piss! is a badly drawn pornography involving Bart and Lisa Simpson. Bart walks in on Lisa while she is urinating, to which she shouts "Bart, get out! I'm piss!" It is a popular catch-phrase, and is normally used when drawn-sex.com comics (where this comic came from) are flooded in /b/.

• 
  The original comic that started the meme
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  Blu-ray cover
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  I'm piss