I guess it means his ancestors blew all his family's money on promiscuous women ("fast women") and gambling on horse racing ("slow horses" = horses that didn't win the race). More figuratively, it could just mean they wasted all the money on frivolities. meowth is that a correct use of "at best" in the very first sentence of the message?
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meowthis that a correct use of "at best" in the very first sentence of the message?Not quite. You could say