Meaning
A scowl — a hard, frowning, screwed-up face that shows anger, contempt, or a foul mood. To 'screw up yuh face' or just 'screw' is to make this look; a person who wears it habitually is said to have 'screwface'. Immortalised in dancehall (Beenie Man's 'Bad Man Nuh Dred... Screwface'), it signals hostility without a word.
Examples
-
Wha do yuh? Why yuh a screw-face so?
What's wrong with you? Why are you scowling like that?
-
Him walk in wid a screw-face pon him.
He walked in wearing a scowl.
-
Nuh screw up yuh face pon mi.
Don't scowl at me.
-
Weh mek yuh a walk roun wid dat screwface pon yuh?
Why are you walking around with that scowl on your face?
'a walk' uses the continuous marker 'a' before the verb.
-
Him screwface up when mi tell him seh di money done.
He scowled when I told him the money was finished.
Here 'screwface' works as a verb, 'screwface up' meaning to twist the face in displeasure.
Origin
From 'screw' (to twist/tighten) + 'face'; the tightened, frowning face of displeasure. See Vex-up, Bad-eye.
How it’s used
A scowl/frown of anger or contempt; 'screw' = to scowl. See Vex-up, Bad-eye, Cut eye.