It means, "Very impressive!"
muy impresionante.
It means "You are impressive", but you could substitute any number of English words like "awesome" in the place of "impresionante".
Tú piensas que tú eres muy impresionante.
Awesome
"Muy bueno" means "Very good."
It is very good.
"too short"
very white
very unhappy
If you mean 'muy bien' - 'very good', or 'very well'
you are very brave
It means "it is very..."