Bottom dollar definition is - last dollar. How to use bottom dollar in a sentence.
You can bet your bottom dollar (insert whatever sure thing you are talking I bet my bottom dollar that the hidden video game that my mom confessed,is in there.
Your "bottom" dollar is your last dollar; the dollar at the bottom of your wallet (or pocket, or piggy bank, etc.). "You can bet your bottom dollar" means something.
Learn this English idiom along with other words and phrases at Writing Explained . Bottom dollar meaning and bet your bottom dollar origin.
to be certain enough of something to wager everything. He talks about it a lot, but I would bet my bottom dollar that he has never actually been there.