1) adjective: thoroughly and usually unbelievably awesome; the embodiment of all that rocks worlds.
2) adverb: an expression of affirmation, used in the same way as word.
3) interjection: used to express pleasure, delight or amazement, often at something gloriously magnificent.
Jake: Last night when we were playing Rock Band I totally got a perfect on every single guitar solo I played, and I was even playing on expert. It was so jumba, dode. I totally rolled that shit in style.
Alice: Dude, friggin' jumba! You've been practicing it a lot, yeah?
When your mate is bending over or just standing quietly (works best when they are not expecting it) You get your middle finger and shove it right up there asshole as far as it goes. Then watch them jump3 meters in the air.
I gave frank the biggest jumba just before and he jumped so high...... and he didn't evenclench