arm trophy
dude, did you see that chick with dean? she was so hot, is that his girl?  nope, she is just another accessory, like an arm trophy
either a male or female companion that is very attractive and desirable to be seen with in public
"dude, did you see that chick with dean? she was so hot, is that his girl?  nope, she is just another accessory, like an arm trophy" What is the definition of "arm trophy"?