I just think your focus didn't appreciate being parked near a dumpster. She's more sexy and worthwhile than that!!!!! Trying to tell you to buy a Civic to cart garbage!!!! It's a garbage cart already...
in response though, to the best of my knowledge, the only liquid that travels deliberately into the hatch is the rear washer fluid piped to just above the brake light. It shouldn't have come out the latch. Just check your rear washer to see if it still works then open the hatch to see it it pisses on you again. Otherwise my guess is a possible leak somewhere in the lower half of the trunk, such as just below the rear glass or in the licence plate screw holes.
2002 Machine Silver Zetec 2.0L, Manual 3 door, ST170 Suspension, 17" ST170 Wheels, ST170 front grille, ST170 interior handles, Genuine Ford Alloy & Leather Gearknob & Handbrake, ST170 clear side indicators, Electric Blue Zetec floor mats