The act of farting in the shower as water muffles the noise causing it to sound somewhat like Donald Duck laughing.
by StolenDignity March 22, 2012
 Get the Shower Quackmug.
Get the Shower Quackmug. When a fart is conducted in the shower and the water running over the anus makes it sound like a duck quacking.
Friend 1: "I farted in the shower earlier and it sounded like Donald Duck laughing."
Friend 2: "SHOWER QUACK!"
Friend 2: "SHOWER QUACK!"
by Unwept, the Lone Magpie March 23, 2012
 Get the Shower Quackmug.
Get the Shower Quackmug.