Synonyms for Meathead:

n.

ability, gawk, hulk, klutz, lout, lug, lummox, lump, meatball, oaf, ox. dummy (noun)
blockhead, dimwit, dolt, dullard, dunce, fool, ignoramus, lout, lump, moron, oaf, ox, simpleton.
fool (noun)
blockhead, bonehead, bungler, clod, cretin, dimwit, dolt, dullard, dumbbell, dummy, dunce, fool, half-wit, ignoramus, imbecile, loon, moron, nincompoop, nitwit, simpleton, crackpot, chuckle-head, knuckle-head, lame-brain.
stupid person (noun)
dolt.

Other synonyms:

lummox, meatball. gawk, klutz, lout, lug, oaf, ox. hulk. lump. Other relevant words:
gawk, hulk, klutz, lout, lug, lummox, lump, meatball, oaf, ox.