Top definition
Boner: No Apparent Motive. When a male has an unexplainable erection.
Dude, I had BNAM when I was listening to our chemistry lecture last Friday. I guess my body thinks chemistry is a lot more interesting than my mind does.
by Eastern Wanderer July 18, 2009
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug