1. The act of stopping a male erection dead in its tracks.
2. Any event so shocking it causes a boner to instantly die
3. Used to describe the ugliest of women
"I was so drunk I almost fucked Joknisha last night, but even alcohol couldn't mask the smell of that vag."
"Ahhhh, that shit is the anti-boner"
"I heard horse faced Gina started to grow a mustache."
"That girls smile is the anti-boner."
"The other day I was making out with my girlfriend, and her grandma walked in with her top off... instant anti-boner for life."