Chancer
Heard in Dublin, Wicklow, Kilkenny, Galway, Longford, Kildare and Limerick
An opportunist, a scammer! I think it comes from "Chancing his arm", like "trying his luck"!
He was trying to charge me EUR 10 instead of EUR 5, the chancer!
He attempted to relieve me of ten euros instead of five, the opportunistic scoundrel.