While you are having doggy style sex with a girl, a friend hides in the closet and times it perfect to where he steps in and continues to fuck her without her knowing of the switch. At that point you run outside and around to the window she is facing and wave to her.

Adjective for something that definitely wasn't lame, but not quite "hot". In other words, slightly below being hot, therefore warm, like a nice pair of mittens.