It's an anime character's last name. Its full name is Minoru Mineta . It is of low stature and youthful appearance. He studied at Yuei Academy. His hair looks like a bunch of grapes and from which come some sticky balls that serve as a weapon. It is also known as Grape Juice.
I always thought "mineta" alluded to the French term "minette", which means kitten, minino, micifuz. The action of these little felines when drinking, reminiscent of the attitude of the cunnilings
It is a way of calling cunilingus that is used in lunfardo. It comes from minette, which in French slang names the "clitoral suction". See mansher.