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Typically one who catches feelings very quickly for others who do not feel the same way.
Related to the word simp
He liked her a lot, she did not like him back, he is probably a Shima.
The act of fucking up so bad that it somehow results in something equivalent to being fucked from behind into the ground by a horse while a pack of kittens vomit all over the back of your head, generally occurring when missing a mark.
The other night I took this girl home from the bar but it turned out she was a dude and I had sex with it anyways. The next morning the dude woke me up and said "I'm leaving now baby cakes, I hope you didn't mind pulling a shima last night - my bad."