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The most evil english teacher you will ever have in your life. Her actual name is Sheahan, but it was modified for obvious purposes in all who fear her. Beware, she laughs like a witch and has a wig-wearing monkey hanging beneath her TV. SCARY AS HELL!
Omg, I friggin' hate the Sheahag!

Student 1: My english teacher gave me so much homework!
Student 2: Aw man, you got a Sheahag!
by i must escape April 12, 2010
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