I was vering CPU when a blue shell came and all I had was a banana I made a drift when it came down and let go and it didn't hit me
(there are more ways to dodge)

Yea, probably.

So far, there has been no videos/proof/report that a drift in MKW can dodge a blue shell. Can you replicate what you did? Maybe record a vid, or have someone else do it and record a vid? Or was it just you running over a shroom or into a scripted cannon?

no a just a lucky shot i guess(lol) but it did happen

I don't see how a drift + miniboost would dodge a blue shell, the boost doesn't generally speed the kart up far enough fast enough. Did the blue shell explode at all (i.e. possibly it hit the banana or another item behind you instead of the ground)? Did you have a star or a mushroom of any type activated? Were you also slipstreaming behind someone while doing the drift or activating the mini-boost?

Never thought of that. Nice!