When one person takes a seated position with their back pushed against a wall much like the "wall sit" exercise position. A second person will then press there ass against the first individuals face, pinning their head against the wall. Then, with as much force as person two can muster, shit into the face of person one.
Don't work out in front of Jason, he'll give you a French wallsit.
When 2 gay men are having intercourse facing a wall with a suction cup dildo built into it and the man giving has a dick similar to a barracuda and the man receiving is getting it so hard that he is forced to bite down on the dildo to cope with the pain, like eating a French baguette.