The math a younger girl does when she meets an older guy in a bar, where she finds how old she was when you were her age.
I'm too old to meet women in bars anymore, I don't need there barithmetic, making me feel older than I am!
by DAVnCHAINS March 31, 2015
noun- the process of calculating how many drinks one could buy at the bar if they forgo paying a bill.
Daniel: "Johnathan, if I forgo bearing the expense of my gas bill, we can get intoxicated tonight!"
Johnathan: "I dare say, during this recession, that is an ingenious use of your barithmetic!"
Johnathan: "I dare say, during this recession, that is an ingenious use of your barithmetic!"
by hsfe325 November 30, 2009