screwed up

No — say "I screwed it up.". When the object is a pronoun like 'it' or 'them', it must come between the verb and the particle.

Definition

phrasal verb. to make a mistake or handle a situation badly. You use this when you have done something wrong and caused a problem.

phrasal verb. To commit an error or mismanage a task. The verb is informal and functions both transitively and intransitively.

simple

“I really screwed up my chance to get that job.”

contextual

“The team screwed up the final play of the game, which cost them the championship title.”

complex

“The project failed because the lead architect screwed up the initial measurements, rendering the entire foundation structurally unsound.”

This is an informal expression; use 'made a mistake' or 'erred' in formal writing.

Explain that while 'screw up' is informal, it is generally considered safe for most social situations, unlike more vulgar alternatives.

I screwed up it.

I screwed it up.

When the object is a pronoun like 'it' or 'them', it must come between the verb and the particle.

Particles

up

Separability

optional

Pattern

screw + up (+ object)