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the look of pure horror when you think you're about to fart, but you're actually shitting yourself instead. it's like your face is screaming 'what the actual fuck?'
my math teacher had a face shart when she tried to fart during a pop quiz and her pants were soaked
my dog had a face shart when he tried to fart in the car and pooped on my shoes
my cousin had a face shart in the middle of a pizza party and no one knew what happened