How can I get even with the mean girls?

Don't even bother with the whole "don't bother getting even; tell a teacher or principal" crap. I've been walked all over and made fun of and had attitudes toward me my whole life. This school year is going to be different. Anyone starting sh*t with me this year, I will get even and/or kicking some ass. What are some good ways to come back real fast? My mom told me one time she put a girl's head and really long hair in the toilet and flushed it lol. I want stuff like that. Thanks :)
How can I get even with the mean girls?
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