Somebody with weird looking poops. Named after capybaras, which poop in squares. Anything weird about these people can classify them as a capypooper.
My friend is such a capypooper. They always have a weird tint in their poops.
Somebody who is over all annoying, with a variety of other possible side affects. They typically never get any romantic relationships. They often do annoying things randomly, with zero context. Example: unfunny your mom jokes, random cringe songs out of nowhere, and rick rolls. They will almost always think they are hilarious, cool, or both.
You are such a Baby Boo! Why do you rick roll me every day?