Found in a portable toilet or port-o-let at a construction site. It is the lid that closes the toilet which is believed to be a tunnel that leads to Mexico that many of the workers at the construction site have emerged from.
Man are there any Americans employed by this contractor or does he just open the Mexican escape hatch to find a crew.
The smallfolded opening which is found in men's Y-fronts which enables the wearer to urinate without pulling down his underwear.
"Sorry about that vicar. I believe the explosion was caused by your candle igniting a smallpocket of fart which had become temporarily trapped in the piss hatch of my trollies..."(etc)