A suicide wank caused by action of a third party, primarily a cockroach.
When you are having a wank, but a cockroach come flying at you, so you shout out "Mom" or "Dad", so you try and finish the job, fueled by fear and for not being a quitter before the cockroach land on your dick or they get into your room!

when you're hungover as shit after a spending a night drunk as a skunk