Neglecting to wash one's feet for long enough for them to stink like sour tit milk and proceeding to jam your a toe into any hole of the human body. Preferably the big toe for maximum penetration. Also, wiggling of the toe is not required but is a nice touch.
Jake: Dude I have been walking barefoot everyday for the past 2 years since I became a homeless man.
Pat: That's awesome, I see you haven't trimmed those toenails in a few years either
Jake: Hell yea. Best part is that hott ass hobo slut Janine said she was in the mood for a crusty toe jammer and I get to pick the hole!