"Toilet" was by etymology a euphemism, but is no longer understood as such. As old euphemisms have become the standard term, they have been progressively replaced by newer ones, an example of the euphemism treadmill at work.
This just isn't true. In today's game it's very common for a player with the ball, in the area, to go down after the slightest contact from an opposing player, rather than stay on their feet and shoot.