Oh My Bad 

1. It's a strong emotion or exclamation of acknowledging your shortcoming, fault, or evil done.
2. It's expression of surprise out of wrongly said or done.

oh my bad! I press the wrong key :-(

Oh My Bad by primaverabebe May 4, 2011

Oh my badness! 

The opposite of oh my goodness. When we have said or done something bad or sinful it is ones badness that had caused one to behave in such a manner.

Oh my badness! I have set the house on Fire.

Oh my badness! by green923jade October 20, 2016