Top Definition
1) when all of the sudden you are hard...

2) when you hear good news and you get a boner!

3) when a black man touches you

4) when a jew finds a penny

5) pretty much any time you listen to Creed, Nickelback, or Naked Truth

6) when you remember something from a long time ago (see nostalgia boner)
#1
Fuckhead: DUDE DID YOU HEAR THE NEW NICKELBACK CD?!?!?!!?!?

Even More Fuckhead: YEAH! I GOT A RANDOM BONER!!!!

#2
Naked Truth Fan: I THINK! I GET! YOUR POINT!

Other guy: WOAH RANDOM BONER!

#3
Black Guy: *touches some guys dick*
Some guy: RANDOM BONER!
by @xtylerryanx January 08, 2012

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