skittle dumping

It is slag for "may I have change please?"
Skittle Dumping is a way to ask for change

An old lady at a cash register:
Clerk- That'll be $28.75.
Mildred- Can I have my skittles dumped?
Clerk- Sure. Here's $1.25 back. Have a great day
by Didymussometimes September 22, 2017
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