Green’s Dictionary of Slang

chepemans n.

[Chepe, Cheapside + -mans sfx; Cheapside market, ult. f. OE ceap or chepe, was medieval London’s main market, flourishing until Henry III (r.1216–72) decided to diversify food-selling into other areas]

(UK Und.) Cheapside Market.

[UK]Rowlands Martin Mark-all 37: Chepemans, Cheape-side market.