Plutoid

Adjective used to describes someone of small stature or intellect. Usually used to insult someone who is small/short or is just fucking stupid. (Derived from the astronomical term Plutoid, another name for a dwarf planet).

Sam: Bro, is Haydn like 5'3"?

Alex: Dude's a plutoid

Or

Alex: Did you hear how Haydn failed the English Essay?

Sam: What a fucking plutoid.