A person who clearly does not know the meaning of shutup. But uses it against others all the time.
Andrew: Hey, you're a dork.
Andrew: Stop saying that word!
Andrew: Oh, God. You're such a Memito.
a cocky male athlete that has an a unusually small penis, but is still very willing to have sex with anybody
dude1: hey how was that tournament yesterday
Dude2: man im hella upset cause i was talking to some girl and joe pulled a memito on me
Dude1:so what happened?
Dude2:she hooked up with him even though he's a memito