A person who attempts to be all things to all persons, and has no solid inner core of values. Usually a politician. To be used sparingly, especially when either "tool" or "bitch" would be adequate by itself.
"He'll vote for that, because he's the sponsor's bitch." "It isn't surprising she's out doing his dirty work, she's such a tool." "This guy won't do anything without taking an opinion poll first, and will try to take both sides of one issue in the same sentence. What a ToolBitch." E.G. John Kerry on Iraq funding. "I actually voted for it before I voted against it."
A "Timbitch" is a stupid, gullible person that goes to Tim Hortons after agreeing to buy coffee for 4 or more people, inconveniencing EVERYBODY that's waiting to buy coffee behind them.
You go to Tim Hortons to buy 1 coffee and the person that's before you orders 7 or 8, making you wait longer than you should have to. THAT person would be a Timbitch...