"filth, trash," by 1922, from Yiddish drek (German dreck), from Middle High German drec, from Proto-Germanic *threkka (source also of Old English þreax "rubbish," Old Frisian threkk), perhaps connected to Greek skatos "dung," Latin stercus "excrement," from PIE root *(s)ker- "to cut" (see shear (v.)).
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