Bruised mouth, split/fat lips, other facial injuries caused by performing oral sex.
When the performer is so infactuated feeling the receiving lovers member swell and get excited to the point they begin to hit their face on the person's lap to the point it causes facial injuries.
Example: WOW! Bonnie was so into have Clyde's cock about to explode she didn't realize her busted lip and bloody nose. She made her face a rabbit hole.
Example 2: Jesus Christ Bonnie! You fucked me with your face so hard your love turned it into a rabbit hole