When somebody gets there forskin from their penis and stretches it up onto their head. once the forskin has covered the head they then run around whilst a friend tickles there balls. they then ejaculate all over their face and it is known that the semen acts as a face cleanser.
"oh dude harrys doing a wurcker again"
"i hope he cleans up after he does the wurcker, last night there was semen all over the floor"