Suburban slang referring to the fattious tissue surrounding the vaginal wall, and / or oft used as a colloquial reference to ones inherent or self-evident "sexual aura".
Did you see the "Mother's Lips" on her... It was right there in her camel toe.
Dang, that woman's "Mother's Lips" was banging...
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something you say to offend someone when they ask whats this. or to say something about there mother too piss them off
Ayden: hey whats this?
Logan: ya mothers lips
Ayden: *offended*