O face

[Sarah]

the face one makes just as he comes to orgasm

[Tina]

a term used in the movie Office Space to describe the face one makes when achieving orgasm.

[Britney]

There is absolutely no other definition for [an o] face besides the face a youtube viewer makes when he or she is craving an [outro] performed by [Tobuscus].
Also known as outro-jingle face, or outro face