slang A dull, dowdy, or untalented person; someone who is generally unattractive or unremarkable. From Yiddish. I'll never understand why such a knockout beauty as she is with a schlump like him. The tribute band, as it were, was just a bunch of schlumps in cheap costumes and makeup playing KISS's greatest hits—and playing them badly.
schloompand schlump and shlump (ʃlump and ʃlʊmp)
n. a stupid and lazy person. (From German via Yiddish.) Tell that schloomp to get busy or get out.