when your girl is giving you a blow job & her dad calls to say he's on his way before she's done.

In extreme cases, you may have to hide your erection to go meet her parents.

Warning: This may result in blue balls if you don't finish off yourself. Try to avoid repeated incidents.
guy 1: dude, did she swallow?

guy 2: nah, her dad called before I was finished. I only got half a blowjob
by hisbabygirl August 16, 2007
Get the half a blowjob mug.