Verified answer

In Portuguese "mto" is an abbreviation for "muito" (very).

So, "muito lindo" -- "very beautiful" (describing something masculine)

Mto Abbreviation

"mto lindo" is the abbreviation of "muito lindo" in Portuguese that means "very beautiful" in English but it is only related to male things.

I'm assuming this is portuguese and not spanish, and the person above me was correct in saying muito lindo. I don't think its referring to a mountain =p

so yes, very beautiful

plus if it were spanish and talking about a mountain it would be linda because the spanish word is montaña making it feminine.

if its in spanish, and mto is short for monto, it means "pretty mount" or "beautiful mount", or beautiful mountain.