look up any word, like rimming:
also "cash on the barrelhead". Means that you give me cash, and I'll give you the product at that time. No credit no delivery.
Buddy: You ever think about selling that old juicer?
Barbara: I'll give it to you for $20 - cash on the barrel.
Buddy: OK, here is the money.
Barbara: Thank you, here is the juicer.
Buddy: It has been a pleasure doing business with you.
Barbara: The feeling is mutual.
by smoo-smoo-smoo October 06, 2010
when you have a formidable proposition and want to close the deal
Don: Lookie here boy, I'll give you $50 for it.

Bill: Done. Cash on the barrel.
by T. Polkinghorne April 06, 2009