noun, plural schmoes. Slang.
a foolish, boring, or stupid person; a jerk.
Origin of schmo
An Americanism dating back to 1945–50; of obscure origin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural schmoes or shmoes
US slang a dull, stupid, or boring person
Word Origin for schmo
from Yiddish shmok
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
also schmo, "idiot, fool," 1948, euphemized form of schmuck.
Online Etymology Dictionary, © 2010 Douglas Harper