shizzling the nizzle 

Masturbatory term.

See also:
stroking the sausage
slapping the meat
petting the weasel
spanking the monkey
flogging the dolphin
tickling the pickle
whacking the mole
playing the skin flute
cream-filling the donut

"I can't stand to see him shizzling the nizzle."

shizzling the nizzle by Dean May 13, 2005