Danna is an informal Japanese word for husband. The partner mecha's name, Go/Neo Okusaer, is taken from either okusan or okusama, both Japanese terms for wife.
It's also a pun on the Japanese word maji, meaning "for real" (as opposed to kidding). So when their transformation phrase is "maji maji majika" they're basically saying "what, are you serious?" :laugh:
It's also a pun on the Japanese word maji, meaning "for real" (as opposed to kidding). So when their transformation phrase is "maji maji majika" they're basically saying "what, are you serious?" :laugh: