A person who makes out with people indiscriminately. Caliber of victim normally doesn't factor in and therefore can be quite low. Doesn't usually take it past second base tig ol' bitties
. Tend to not care about their conquests.
"Liam is a lip slut, he pulled Alison's friend and called Amber to come over that night."
"Damn dat bitch be uuglay fugly
, she needs to get with a lip slut"