They're Hittin' Vegas!
Marge and Ethel flashed a bus to get on - or maybe stole their grandkids car! They're winning - they're on a hot streak! They go "all in" cuz they have to replace the car they wrecked on the way! The're besties and have always gotten into trouble together. After the casino, they are going to Denny's (or maybe a strip club - HA!)