When you're so involved in what your doing, you don't notice the large quantity of toothpaste still in your mouth from when you brushed your teeth an hour ago.
ToothPasteGrab (TPG) is an act of grabbing a males' 'tube' and grabbing it with intense force, that the male releases sperm (occasionally all over the place). Its also the only technique used on guys, that ISN'T torture, in fact men do enjoy TPG quite alot, the harder, the better as they say.
Charlie had been mistaken for having the ToothPasteGrab done on him, but fear not, sperm is all over the walls.