The act of driving rediciously modified trucks, preferably Chevrolets 1973-87 (91 on subs and blazers), through vast expanses of increasingly deep and gooey mud.
Cum in the butt of your partner, then push them down on their stomach, you then proceed to stomp furiously on their butthole, till the cum and poo flow out.
When a woman is laying on her stomach and shits herself. The guy comes from behind and slaps his penis on the shit and moves back and forth. Then slams it up her ass. Just like getting stuck in a mud hole