Bet Your Bottom Dollar

In the Great State of Texas, your bottom dollar is your last buckaroo. If someone says you can bet your bottom dollar on something, that means it's an absolute certainty. You can count on it happening. Nobody, after all, would want to bet their last buckaroo on something if there was a chance of being left busted flat.

Example 1:

"You reckon it's gonna rain?"
"You can bet your bottom dollar it's gonna rain. I saw a bunch of animals lined up two by two getting onto a great big boat. It's gonna come a gully washer."


Example 2: 

"Hey Roy, ol' Billy Bob said he could whoop you any day of the week."
"Ol' Billy Bob's about to eat crow. You can bet your bottom dollar on that."


Here is Corsicana's own Billy Joe Shaver singing about that "Bottom Dollar."