Peruvian slang used to describe something that exceeds all expectations, and is amazing. Usually used to describe food that is mind blowing and delicious.
Direct translation would be something like: "Wow, amazing!"
" That risotto... Pucha buenazo!"
"This restaurant makes the best ceviche, every time I try it I say pucha buenazo!"
"How is your burger?"
"PUCHA buenazooo..."