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1.
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 03, 2011