^ Harry:
"411" is the number in the US people can dial for
information. Think of it like an operator service.
"411" was adopted and made a part of American colloquialism and slang.
Therefore the sentence:
"Here's the 411 on Melissa's breakup with that idiot."
translates roughly into:
"Here's what happened with Melissa's breakup with that idiot."
So, "411" is ~ "information" ~ "scoop" ~ "skinny" ~ "deal"
Sorta like how "Five-O" or "5-O" has now come to mean THE POLICE or the authorities [but mostly referencing cops].
Kids these days...