The word crap, meaning excrement, is from an English dialectical word originally meaning chaff or the discarded husks of grain. The ultimate origin is not certain, but it could be related to the Old French crappe, meaning siftings or grain left on the floor of a barn, and the medieval Latin crappa. From Promptorium Parvulorum Sive Clericorum, Lexicon Anglo-Latinum Princeps, from c.1440:
Crappe, or gropys of corne, acus.
(Crap, or crapis of corne, acus.)
By the end of the 15th century, crap was being used to refer to the residue left by rendering or melting fat.
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