fuck up phrasal verb ( see also ↑ fuck )
1 . fuck somebody ↔ up to make someone very unhappy and confused so that they cannot live normally or have normal relationships ⇨ mess somebody up :
Heroin fucks you up.
2 . to make a mistake or do something badly ⇨ mess up :
You really fucked up this time.
fuck something ↔ up
I’m scared of fucking things up.