When you touch an older woman's boobs and you wanna be cute doing it.
Me: *Touches boobie*
Woman: Hey!
Me: Oopsie Poopsie!
Woman: Aww your so cute dear!
idk like i heard TheOriginalAce use it as a minecraft server slogan so it must be a cool double word
dude1:hey whats your fav server slogan
TheOriginalAce:oopsie poopsie
when you have diarrhea and you shit yourself in the toilet on time but explode the whole portaa potty full of shit and you have to clean it up
i went into the porta potty and oopsie poopsied the whole thing