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1.
Doing a Poopa Turdy is to pretend that you have 'accidentally' spilt hot chocolate over your lap and friend's bedsheets, when really you have just farted and 'accidentally' followed through.
*Whilst watching a film*

Girl 1: "Hey, err, what is that on your lap...?"
Girl 2: "Oh! It's just hot chocolate, I swear! She knocked it over me when she sat down!!"
Girl 3: "Are you sure? I think you might have done a Poopa Turdy."
by notpartofthedoodlecrew May 21, 2010