Stretched Lips 

When you try and eat something and your lips get permanent stretch marks.

Who you foolin'? You gots stretched lips from suckin' on the cucumber fool.

Stretched Lips by alkdjnne October 13, 2008

stitched lips 

having "stitched lips" means that won't tell on your affiliates for doing dirt
usually used within gangs or criminal organizations

"Stitched lip society"
"I kept em stitched lips bro"

stitched lips by misfortune December 15, 2017