A triple entendre referring to a woman that is extremely fake-tanned to the point of being orange (bronze), is good-looking enough where a douche-bag might be proud to be dating or married to her (trophy), but will ultimately come in third place or lower in any reasonable contest of beauty or worth (bronze trophy).
"Whoa, look at that dude's hot.... orange...."
"Leathery?"
"Yeah... kinda' leathery.... girlfriend. At least she works out a lot."
"Yeah, bro. She's a real bronze trophy."