A Mongoloid is often described as a physically deformed person, preferably with a lower then usual mental capacity. Facial scars, visible tumors, missing limbs, over bites along with wardrobe are usually bonuses or signs that the person in question is, indeed, a Mongoloid. Mongoloid's abbreviated forms are usually more derogatory then the full word. "Loid" is an example.
"Wow, that dude sure is a mongoloid."
Loid (abbreviated) -
"CHRIST, LOOK AT THAT LOID OVER THERE!"