What is Screw Up?
1.
someone who messes up consistently
Your failing, Jimmy?! I swear it, you're gettin to be a screw up.
See
2.
Screw up is when you say the wrong name to your bitch while having sex.
uhhh Britney spears, you're so hot - SLAP - My name is Celine dion you stupid motherfucker!