1 definition by Frank Lucius Grelmo
A deliberate action in which the area between one's scrota and anus is beset by a ferocious manipulation, by way of hand, mouth, lead pipe, a wayward retainer or any other intrument (hereby defined as an object which is capable of damage to the aforementioned area).
When Martha found out that Gilgamesh was having sexual intercourse with her sister, she grabbed a bowling pin and gave him a grundle shredder that required twenty-three taint stitches.
by Frank Lucius Grelmo October 30, 2006