“big rubble tubble” is the adjective part of the definition, but “big rubble tubble bitch” is the whole definition. Can be used as an adjective or noun. Describes a “bitch” who is so big (s)he looks like they’re about to “tubble” (tumble) over, and/or looks like a pile of rubble. Can be derogatory but is usually in a joking manner.
Person A: Have you seen that dude Emanuel? He’s kind of big.
Person B: Yeah, he’s a big rubble tubble bitch. He broke my headphones just by breathing on them.
Person B: Yeah, he’s a big rubble tubble bitch. He broke my headphones just by breathing on them.