What is "whoopsy"

Usage examples of "whoopsy".

So here she came, thick legs spread, candy-pink in their support hose, one arm clutching her purse to her immense bosom, the other held out for balance, head down, eyes searching for the islands of ashes where some responsible building super had already been out (Jesus and Mother Mary bless those good men), also for the treacherous patches that would defeat her, that would send her whoopsy with her large pink knees flying apart, and down she’.