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
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 like yogurt.
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.