An informal interjection used to call attention or greet someone (like 'hey' or 'yo').
よー、ちょっと手伝ってくれない？
Hey, could you give me a hand for a moment?
よー、久しぶり！元気だった？
Yo — long time no see! How have you been?
よー、そこの君！少し待ってくれ。
Hey you there! Wait a moment.
A particle-like empathetic/affectionate form of 'よ' used at the end of sentences to add emphasis or warmth.
早く来てよー。もう待ってるから。
Come quickly, okay? I'm already waiting.
そんなに心配しなくていいよー、全部うまくいくから。
You don't need to worry so much — it'll all work out.
もう終わったよー。手伝ってくれてありがとう。
It's finished now. Thanks for helping.