Usually applies to a gift as in "that's a rubber batman!" If it's a "rubber batman" no matter what the gift really is, it means the giver expects to receive amazing and great pleasure from the gift, even if the recipient also likes it. The real point of gift "bounces back" like a rubber batman.
"You got me new undies?! That's a rubber batman for sure!" or "I love this new cookware....but that's a total rubber batman, fool."
by Chuck and Tony February 25, 2019