Likely source is the automatic defrost system and its drip tray. I'll give you three things to check.
1. Inside the fridge and hidden, there is a system to defrost the freezer automatically, with a tray to catch the melt water. From it there is a hose (sometimes you can see it inside the fridge) that goes out the back. Usually there is a fitting outside on the back, often between the back and the black-colored gridwork. Then there's a hose from here down to another water tray underneath the fridge at the bottom. The melt water is supposed to go down to the bottom tray, then slowly evaporate from there. Now, if the hose or any part of the upper tray and fittings gets blocked off (often with black mold) the whole system can back up and overflow water onto the floor, instead of into the bottom tray as it was supposed to do. Sometimes the hose on the back simply pops off the fitting and needs to be re-connected. Also check to be sure the bottom end of the hose actually drains into the bottom tray, and not directly onto the floor. IF you have to loosen the black gridwork on the back to get at the tubing, be VERY careful not to pull it or bend it too far - it is a radiator full of refrigerant, and any break or leak in it will ruin your fridge!
2. Sometimes this system is working perfectly, but it's just so hot and humid that the fridge defrosts very often and the bottom tray never evaporates fully before more water arrives. Then it can overflow. If that is happening, not much you can do, except for item 3 next.
3. If your door seal is poor, too much warm humid outside air gets into the fridge and it defrosts too often. Or sometimes, it's just that there is condensate forming at the door seal because of a poor fit and it drips down the front outside of the fridge. Either way, here's how to check the door seal. Simply get a piece of paper - say, a regular typing sheet. Open the door, then close it on the paper. By hand, pull the paper out of the seal again and feel how much drag there is. If there's little or no drag, the door is not sealing in that area. Work your way around the door to check it all. Then what? If the door adjustment is off you may be able to fix it by loosening the hinge mounting screws, moving the door slightly and re-tightening them. For example, if the poor seal area is near the top and on the handle side, you try to move the door top OUT from the fridge body so that it can close properly all the way across the width of the door (instead of just near the hinge). On the other hand, if you have odd scattered poor sealing areas, the problem may be simply that the seal is old and has lost its flexibility and should be replaced completely. Get parts and do it yourself if you can, or call a service tech.
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