万万 (wàn wàn): hundred million; (fig.) enormous quantity; absolutely; certainly (usually followed by a negative expression)

He never ever expected that he would actually win first place in the competition.

You absolutely must not tell him about this, otherwise the consequences would be unimaginable.

I never ever imagined I would run into an old friend I hadn't seen for years in a foreign land.

You absolutely must not be careless; a tiny mistake could cause the entire project to fail.

She never ever expected that a photo she casually took would actually become popular online.