sonic hydrobating

When you use the sounds of other things in your bathroom (the bath filling up, the bath draining, a running blow dyer, the heaters, etc.) to cancel out of the sound of you masturbating in the bathtub. While done successfully 90% of the time, your parents, roomates, girlfriend, (etc.) may become suspicious of extra long baths.

Dude 1: Dude I just had a nice and long sonic hydrobating sesh

Dude 2: Really dude? What noise did you use
Dude 1: I used a shower speaker and turned it up