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 classic scene, purple headed yogurt slinger is the final example prior to pedro.
After the cock has become fully erect, and the choking of the member has turned it a light tint of purple, a consentrated, fishy-smelling white substance is slung from the head likeyogurt.
After a woman has performed felatio on her man(hopefully her man) and she has yogurt on her face, the Purple Head has Slung the Yogurt.