Describes the way a girls nipples are pointing. When a pair of breasts sag and the nipples are pointing downward. These are some of the worst of nipples you can encounter.
Jay: So how was jen last night did you hit it?
Tom: Yah I did she was great but her nipples were downward firing.
Jay: Ouch that sucks.
Tom: Yah it was a major let down.
by Ryan_M. April 9, 2006
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