1) Opposite of arroused. Especcially around hideous women.
2) Anytime someone happens to see your manhood and it is half its usual size.
"Man did you see that ugly bitch?"
"Yeah man, she gave me an Anti-Boner!"
"Yesterday when Jimmy pantsed me he took my boxers down too. Worst of all Sally saw and I had an Anti-Boner!"
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