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1.
When something is so outrageously awesome, it feels like multiple simultaneous boners. While this can be applied to anything, the majority of instances are used to describe incredibly attractive women.
David: Dude, those chicks over there are fuckin' hot.

Matt: Oh yeah. Boner city.
by Melamed May 14, 2008
 
2.
1. A feeling so great that it is like having multiple erections at the same time.

2. A synonym for sausagefest.

3. A synonym for awesome.
Examples:

1. That BJ was sick, it was fucking Boner City last night.

2. There's no girls at this party, it's fucking Bone City in here.

3. Damn those bitches are hot, fucking Boner City
by Billcheese1 January 31, 2010
 
3.
Popular 80's term referring to the massive boners given by donkey-zebra-Hulk Hogan cut-out sex acts.
It was so bonercity that I couldn't drive home alone.
by Dr. Edward McTwlightstein February 10, 2010
 
4.
When something is so great that it causes a boner.
Carly- Did you see that guy I was dancing with? It was boner city up in there!
by JRoseHausler December 15, 2011