Anu declaims: From Yiddish shlumperdik; I recently used shlumperdik and gave the derivation as being from shlump. it's probly indeterminate, given the source.

on a related note, I read somewhere recently that the "sch" often given for transliteration of words like shlump, shnook, shnorrer isn't best.

-joe bfstplk