a shark
you got so curious about that Urban Dictionary definition (not mine) you looked up shark thinking it would be a way to have sex, but you already knew what a shark was (a sea animal that eats your guts). well, no!
I looked up shark thinking it was a way to have sex but got a sea animal that eats guts.
He looked up shark thinking it was a sexual thing but got a sea animal.
She looked up shark thinking it was a sexual thing but got a sea animal that eats guts.