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Basically something that disgusts you, find embarrassing or unappealing (mostly) about the opposite sex.
1. Lisa: "So, my boyfriend and I had sex for the first time last night."

Natalie: "Really!? Oh my god, how was it?"

Lisa: "It was okay... but when he started climaxing, he farted! It smelled so bad!"

Natalie: "Ew!! What a turn off!"

2. "There was this random girl who danced with me at the party last night. She was so hot. But when she grinned at me at me, I noticed she was missing two front teeth. Immediately turned me off, man."
by HaltDenMund December 20, 2010
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Things that will make what seems like a really good time in bed, into something unpleasant and embarassing.
"My ex does a much better blowjob than you"

"Is your mother/daughter dating"

"How much do you weigh anyway?"

"Can we get this on"

etc, etc
by Indeedlydoo August 11, 2005
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when u r really horny and suddenly u see something that takes the feeling away.
like if u see a girl and she starts giveing u a bj and ur like fuk yea this is so hot and ur excited and "turned on" and then she takes off her pants and has a dick and then takes off her/his wig and is a man then ur like wtf, want to go puke, want to kill it, and are "turn off"
by Jamal Smokepot November 07, 2010
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