When eating Spaghetti the leftover sauce on your lips and around your mouth.
When you kiss something or you put your lips on a napkin, it looks like you put cheap lipstick on and it rubbed off.
The left over ring of dried spaghetti sauce around a person’s mouth after they eating saucy spaghetti.
Example 1 - What do you think you're doing babe? You are not going to kiss me while you still have spaghetti lipstick on!
Example 2 - You look like a 5 year old that got into his mom's lipstick. Nice job with the spaghetti lipstick.