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1.
a boner dollar is a one dollar bill that has the letter B written in front of the word "one", which is found on the back of the dollar, and the letter "R" after it, thus spelling "BONER".

Commonly referred to as "boners"
I now get 1 more boner dollar an hour!!

I went and bought some bawls with my boners
by Teh sombar April 13, 2008
 
2.
The last dollar spent by any male for any purchase that precedes a sexual act.
I've been saving this boner dollar because I want to bang this bitch after a trip to the dollar menu.
by Room 140 March 06, 2012