For now
Temporarily.I do not plan to buy a new computer for now.
For love or money
By any means available.We were not able to get our boss to agree to the proposal for love or money.
For a song
For very little money, very cheaply.I was able to buy my new car for a song.
Footloose and fancy-free
To be without responsibilities or commitments.The couple were footloose and fancy-free and they could do whatever they wanted.
Foot the bill
To pay for something.The company will foot the bill for my move to Paris.
A foot in the door
An opening or opportunity to do something.I got a foot in the door when the company accepted my application.
Fool around
To spend time playing rather than working, to waste time.If the man would spend less time fooling around he would be able to get more work done.
Food for thought
Something worth thinking about, something that provides mental stimulation.I do not agree with the proposal but it does give me food for thought.
Fond of (someone or something)
To like someone or something.Our daughter is very fond of her grandfather.
Funny ha-ha
Amusing, comical.It was not funny ha-ha but it was still rather amusing.