It's the sweat you get in the crack of your ass when your roasting your balls off.
Boy OH BOY!! It sure is hot as hell in here today,PATTY.I have got some serious ASS GREASE goin on.PEGGY laughs,and says WHAT THE HELL are you talking about? ASS GREASE MOMMA ,ass grease,then after some explaining she agrees,it is as HOT AS HELL.(TRUE),(TRUE)