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slang A large, strong, typically bumbling or foolish person, especially a man. Sometimes used endearingly. You wouldn't be acting so cocky if that lummox weren't here to back you up. Ah, come here and give me a hug, you big lummox!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lummoxand lommix and lummux (ˈləmɑks and ˈləməks)
n. a heavy, awkward, stupid person, usually a male. Sam is what you would call a lummux—but not to his face, of course.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.