Wiktionary
stuff up
vb. 1 (context idiomatic English) To ruin 2 (context UK Australian English) To make a big mistake 3 cause to be blocked
Usage examples of "stuff up".
This place is dead, but the Countess says they'll soon be shooting some tenement-house stuff up at the Consolidated.
Marco, you wait a bit and when no one's around, you can go and pick the stuff up.
They, and only they will pack this stuff up for transfer to Xerxes, and I’.
He had gone in to see Mike Stearns about maybe writing some stuff up to go to the doctors in Venice and Padua and Florence and so on, and maybe make himself available to do seminars and classes for visiting alchemists who wanted to raise their game.