Shower Growler
When you are showering with someone you press your buttocks against the wall and break wind; protruding a rumbling flatulent sound and vibrating the walls of the shower. This sounds much like a growl from a woodland critter.
Tina and I were making passionate love and she pushed me against the wall. I couldn't help but let a shower growler loose, thus ending Tina's want for any wigglin'.