A character in the movie The Kingdom says:
They celebrated her graduation at the IHOP until some townie called Janet something. I don't know, something not very nice. So the townie didn't see Fran coming out of the head, but he definitely felt Fran's uppercut shatter his jaw.
What does "coming out of the head" mean here? It doesn't appear to be idiomatic, according to Google. For a second I thought it was "coming out ahead", but all sources point to "coming out of the head".