Grumpf
The sound made by the "catcher" when the "pitcher" inadvertently enters the "wrong" orifice.
She let out a loud, muffled grumpf into the pillow when he slipped out and entered the one-way back street!
Grumpf
The multi colored lint that appear from out of nowhere in you belly button
Gosh, I wonder what I wore that made red grumpf appear today.