Masturbation.
In other words:
Choking the chicken
Choking the monkey
wacking off
jerking off
shaking hands with man's best friend teasing the weasel
Dude, we all know that last night you did the five finger knuckle shuffle on the one-eyed, blue-veined, purple-headed, custard-chucking, salty yogurt slinger.
boner
erection
pitching a tent
sporting a wood icicles formed
the march is on
stiffy
mr. mortis
rigor mortis has set in
flesh rocket
jack's magic beanstalk
tall tommy mushroom on a stick
and, uh, pedro
varsity blues classicscene, purple headed yogurt slinger is the final example prior to pedro.