Green’s Dictionary of Slang

glom n.1

[? echoic of the solidity/dullness of the individual]

(US) a fool.

[US] in Amer. Mercury Oct. 161: A guy don’ wanna wuyk, so he tuyns into a glom. Well, de idea is tuh teach de guy tuh be a useful citizen .
[US]Goldin et al. DAUL 82/2: Glom, n. 1. A worthless dolt; an exceedingly inept person.
[US]J. Charyn Marilyn The Wild (2003) 62: Listen to me, you glom.
[US]G.A. Fine With the Boys 167: In Beanville, a glom was an awkward kid, a creep.