When used by a writer (usually a columnist or a blogger), indicates that a description follows of one or more letters to the author that might be considered weird, hostile, or otherwise unusual. Comes from the title of a Perry Como album.
"So he tells me that I'm a bigot because I don't support the rights of husbands to beat their wives. I tell ya, we get letters."
by email@example.com March 26, 2007