spend money like it's going out of style

spend money like it's going out of style

 and spend money like there's no tomorrow
Fig. to spend money recklessly; to spend money as if it were worthless or will soon be worthless. Extravagant? she spends money like it's going out of style! I can't control it. I spend money like there is no tomorrow.
See also: going, like, money, of, out, spend, style