It is gibberish. It means, "If your all." If the 'i' in Si had an accent, it would mean, "Yes your all," and it would STILL be gibberish.
Your my everything
it mean "only you"
Yes, you can
You love is all about you.
It means your the best or i would do anything for you.
'Much with all my heart but if you do not want to tell me
It means, "if you want".
This means "For you and all your body".
"Llámame si tú puedes." means Call me if you can./Call me if you are able.
Uy si tu sabes todo: Translation: Oh, yeah, you know everything. (In a non-sarcastic manner) Uy is not a real word. It sounds like an expression.
You will know if you are cool
I think you mean: "De moi si tu m'aime". In English: It's from me if you love me.