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1.
The defacement of a U.S. dollar bill by adding a "B" to the beginning and a "r" to the end of the word "one" on the back of said bill. This is preferably done with a Sharpie so as to make the defacement that much more prevalent and noticeable.

Once a bill has been converted into a Boner Buck, it can and should only be used in transactions involving strippers and/or ladies of the street (prostitutes). Any other use of said bill is vehemently frowned upon.
Boys get your Boner Bucks ready, we are hitting up Mons Venus tonight! On a side note - you better bring an arsenal of Boner Bucks if you want a Rusty Tromblumpkin.
by P. Britt September 02, 2010
 
2.
Boner bucks were started by the fags at 4chan's with help of an AIDS victim. It is the act of defaceing one dollar bills. On the back of the dollar the word "one" appears, and to make your one a boner buck you simply wirte B and R infront and after the "one", Therefore making it a BoneR buck.
BoneR bucks
by GOLLYMaam April 21, 2009