A woman that is ugly, bitchy, harpy, shrewish, or has any other unattractive characteristic that makes her sexually undesirable to a man. Said of a woman that temporarily kills sexual desire because of physical or personality traits that do not a man want to have her.
Joe: "Kate is a Boner Shrinker."
Alex: "Yeah, she ain't very pretty."
Joe: "Not just that, but she is a complete bitch. That is what I meant."
by skidale September 20, 2008
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Someone so unattractive that it totally turns you off, AKA makes you lose your boner.
On SNL, "Hilary Clinton" called herself a boner shrinker.

I was getting so horny checking out a hot underwear model the other day- then a guy so ugly walked in that I was completely incapable of staying aroused. What a boner shrinker.
by Kr1574 October 17, 2008
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When referring to a man's erection as a boner, a boner shrinker would be anything that diminishes it. Most likely an unattractive woman. Made famous by the 9/13/2008 opening skit of Saturday Night Live dialog by Tiny Fey and Amy Poehler:
FEY AS PALIN: "So we ask reporters and commentators, stop using words that diminish us, like 'pretty,' 'attractive,' 'beautiful.'"

POEHLER AS CLINTON: "'Harpy,' 'shrew' and 'boner shrinker.'"
by ChiGal September 21, 2008
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She's so ugly, she's a boner shrinker!
by Cori Stahl September 17, 2008
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(noun). Comment, concept or event that is a sexual turn off (especially to men). Libido suppressor.
Hillary Clinton is a real boner shrinker - If I need to take a cold shower, but don't have access to water, I just imagine her face or voice.
by oslodude September 23, 2008
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Any situation that causes you to lose your boner very rapidly.
1. When you are masturbating and your parents walk in giving you a "Boner-Shrinker".
2. Waking up in the middle of a sexy dream with a hard-on next to your FAT UGLY companion lover giving you a "Boner-Shrinker".
3. When you are at the beach with a bunch of hot chicks and you have a boner. Then you get in the ice cold water.
4. Hilary Clinton would also be considered a "Boner-Shrinker"
by 1pseudonym145 October 15, 2008
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A phrase used by men to describe something or someone so ugly it "shrinks their boner" or immediately halts an erection.
"Awww man, I saw my grandma naked last night, total boner-shrinker."
by livingalie246 October 12, 2008
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