i dont get it lol.
Someone told the two old ladies they will be screwed if they buy
a used car at the used car lot, as the car will have no petrol and
they will be unable to drive it away.
But the two old ladies think that they will be screwed if they
buy a car at the used car lot, meaning that they think someone will
come and have sex with them if they buy a used car and wait
there.