Best definition
Whoopsy daisy
Used to express acknowledgement of a minor accident, blunder, or mistake.

“Whoospy daisy,I nearly killed myself!”
Whoopsy daisy: define #2
Whoopsy Daisy
Sexual Move: When railing a bitch doggy-style you “accidentally” misfire, drilling the girl right in the ass. When she turns around, you say “whoopsy daisy.”
I was pounding that girl hard when I decided to go for the ass. So I gave her the ole’ whoopsy daisy.