Somone who invites you to his (or her) house, and forces you to bring your own food and water, because they are too stingy to let you eat their own food or drink their water. They often don't let you use their bathroom, so you have to go outside or to the nearest shop if you need to go.
The worst freemantles even drink the water that you bring round their house, leaving you de-hydrated and forcing you to drink coké instead.
"Hey, do you want to go to ben's house tomorrow?"
"OK, but we better buy our own supplies, he's such a freemantle"