arrousion

The act of reaching a conspicuously high sexual state as a direct result of a fictional and unlikely sexual tale, created by oneself, for the sole purpose of gaining and maintaining a boner whilst performing daily tasks, such as work, shopping or driving.

Oh my God mate, i caused myself such an arrousion talking to myself about Jess today.
or..
Mate, is that a screw driver in your pocket, or are you in arrousion right now?