A person who tries their hardest to mooch off of friends, family, etc. This act of 'skimping' may be completed in various different ways such as forcing people to give you rides, asking for people to pay for you and just never paying them back, and going to someone's house and eating all of their food. Skimps are notoriously known for never saying thank you. Someone is NOT a skimp if people OFFER these services and are happy to do it.
Me: Jesus H. Christ, that kid Ryan is SUCH a skimp. He made me drive him across town to get food and then had me drop him off at his friend's house and didn't invite me.
You: Shit. Did he say thank you at least?
Me: Nahhh. Does he ever say thank you?
You: Never. Your girlfriend Chiara is a skimp too right?
Me: Are you kidding? I have no problem driving her around. In fact im happy to do it. She's not a skimp at all. Also she repays me sexually