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3.
noun

To experience something which turns one off or makes one lose sexual interest in the current situation.

antonyms:

hard on
Bro 1: Bro I was just watching these two chicks going at it but it was all downhill from there.

Bro2: Geez bro, that sounds great, what happened?

Bro1: One of them whipped out a dick, gave me a total hard off.

Bro2: Bonerkill and a half, man.
by cahill4554 March 02, 2011
 
1.
The exact opposite of a hard on.
To lose one's erection or sexual urge.
A deflation of the penis due to an unsavory experience or sight.
Also spelled hardoff, hard-off
See also boner-killer
Rosie O'Donnell gives me a hard off.
by robin graves February 21, 2004
 
2.
When you sober up while fucking an ugly broad (Swamp Donkey), the penis actually retacts inword.
Fuckin fat bitch was so ugly I got the worst hard-off ever
by Cellodude February 07, 2006
 
4.
a switch on a penis implant, that lowers it.

a big hardware chain in Japan.

a video game
"I had to return my implant. The hard-off switch

jammed. You may wish for a perpetual hard-on,

but you have no idea."

"What now?"

"They said it would need a month's work. I need a breather

anyway."
by Steed Dropout September 15, 2012