When a woman, either over time or torn down by the tit-murder of childbirth's nipples move from a nice centered pointing up nipple, to a turned down facing the ground nipple.

In some extreme case or the turn down service the nipple will actually go underneath the said tit! thus no longer making it turn down service, just gross!
Damn did you see that old bitch last night? Yeah, i took her home bitch had turn down service!
by Kigstar June 4, 2011
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A girl who looks really hot from the backside, but as soon as she turns around, you see that she's old, not attractive, ugly, etc....
That girl over there, I was checking her out until I saw the front. She was a turn around let down.
by DerekD January 7, 2008
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When an authority figure such as an army captain or schoolteacher threatens to punish you by bending down, grabbing your ankles from behind, lifting you into the air and shoving his dick in your mouth
"Man, my PE teacher was so mad at you yesterday he threatened to turn you upside down!"
by ManJuice98 August 27, 2015
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He is so fast, He is probably doing a turn down with his motorcycle
by simxn December 3, 2021
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