In no time flat phrase
Very quickly; in a short period of time
The incident happened in no time flat.
He is such a genius. He can solve this complicated equation in no time flat.
Very quickly
Very fast.
Quickly and effortlessly
The origin of this phrase is not clear.
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.