costermonger (n.)

1510s, "itinerant apple-seller" from coster (see costard) + monger (n.). Sense extended from "apple-seller" to "hawker of fruits and vegetables," to any salesman who plied his wares from a street-cart. Contemptuous use is as old as Shakespeare ("Virtue is of so little regard in these coster-monger times, that true valour is turn'd bear-herd" "2 Henry IV"), but the reason for it is unclear.