Good question!
People sometimes say “you busy?” to mean “Are you busy?”
in spoken English, sometimes a few words are shortened/omitted to get one’s meaning across faster!
Here are a few examples (we call them “contractions”):
- wouldn’t (would + not)
- can’t (can + not)
- haven’t (have + not)
- should’ve (should + have)
- she’s (she + is)
- he’d (he + would)
- gonna (going + to)
- lemme (let + me)
- kinda (kind + of)
- dunno (don’t + know)
Hope this helps!
Cheers,