Top definition
v. 1.Fladunking from a high altitude. 2.To strike a person's face, as if fladunking, but with great animosity and vengeance.
n. The harsh thwapping of a male's genitalia against an unsuspecting and/or deserving recipient's supple face.
See also: fladunk
"Johnny pounced from atop his pine dresser and gunderthumped Mary in the noggin." - Beauty and the Beast
"Reverend James performed a severe gunderthumping to chastise Billy, the sinful choir boy. However Billy bled and later suffered severe and unrecoverable head trauma" - NY Post 7/31/89
"GUNDERTHUMP!" - Voltaire
by PoonPieHouligan December 14, 2005
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug