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When you don't know what to call a transgender person because you don't really care, so you call them "it" which is a reference to the monster Pennywise from the movie "It". He's a clown, just like people who claim to be a different gender than what they were born as.
Dude 1: "Bro! I seen Mr. Petersen getting head from a Pennywiser in a porta-potty!"
Dude 2: "Who was the Pennywiser?"
Dude 1: "It was Mr. Sparks. He was telling Mr. Petersen to call him Ms. Sparkles while dressed in drags!"
via giphy
by Fearsomes May 17, 2018
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