A viscous deposit or remnant of sexual fluid or fluids on the lips. For example, a hot rope of man jizz laid across the lips. Also, an amalgam of booty juice from eating ass my result in a lip curd.
Rachel used her own panties to wipe the lip curd I roped all over her mouth.
I ate a dude’s ass last night and well......he wasn’t too clean. I got a stanky lip curd.