Synonyms for Meathead:

n.

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

Other synonyms:

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