There is a boy, or, there is a young man. muchacho usually refers to a young man / adolescent
funny boy muchacho = boy gracioso = funny
The boy and una muchacha "The girl" depending on either gender: (female/male)
Un Muchacho como yo was created in 1968.
Un muchacho excelente - 2009 is rated/received certificates of: Spain:T
It means "a guy who talks a lot" in English.
You are a crazy man(boy).
Boy
"Hay un amigo en mi" translates to "There is a friend in me" in English.
Soy un muchacho.
There's a tornado.
it means: there is a problem
An ugly boy