What's skins? and what's mob style?
Skins goes basically like this: say you have 4 people on a card, if one person finishes the hole in less strokes than anyone else, that person wins a "skin". If two (or more) people end up tying, no one wins the skin, and you get a "push". You keep pushing the skins until one person wins a hole outright, and they then get a skin for that hole and every push since the previous skin was won.
Mob style is when you have a large group playing together. Eight people can play doubles skins a lot faster than they can play singles.