The contributor’s mom said this one. It is a congruent conflation of “takes the cake” and “tops them all”, both meaning to win or be the most outstanding in some respect. My guess is that the speaker was also thinking of a cake topper. A big thanks to Mike Kovacs for hearing this one from his Mom and sending it in.
This beauty was spotted by Mike Browning in a local news channel website. The Virginia Delegate Mark Keam was discussing predatory towing and uttered this malaphor. It is a mash up of “it takes the cake” (extreme example, usually bad) and “over the top” (extremely overdone). A cake topping also comes to mind. Here is the link to the quote: http://www.wjla.com/articles/2015/04/predatory-towing-in-the-dmv-gone-in-60-seconds-113447.html. Thanks Mike for this one!