When someone is trying to discreetly do something on purpose to drop a hint that would be rude to say out loud, they'll say "oops" to pretend that it was accidental.
A mom enters a checkout lane with four screaming little brats.
Annoyed, the man standing behind her drops a package of condoms in the woman's cart and says, "Oops!" but he does not remove the package.
The freaking iconic words for Larries. Oops and hi are the first word louis tomlinson and harry styles said when they were met for the first time in XFactor's restroom AND GUESS WHAT LARRY THEIRSELF GOT IT TATTOOED ON THEIR EACH ARM