"Dai" is just the word for "giant" and was originally used with "kaijuu" to refer to the Godzilla and other films. I think nowadays they only use kaijuu (but I'm kinda old.... lol). :D
I loved the new "Godzilla" movie too. I really hope they'll make another! :D
Link
Vera
Spleeee this came out so so beautiful! Love everything about it <3333 Thank you!