An expression of agreement. Can be used in place of 'indeed.' Can also be used sarcastically to get someone to stop fucking talking to you about frivolous things.
syn: you said it.
Rhonda: Juan, it's pretty cold outside today.
Juan: And how!
Erin: ...so I told her to shut the hell up because she was being a whore. I mean who tries anal with her boyfriend and then tells the entire cheer squad about it? I swear, Kelly is so totally gay...
Franklin (clearly annoyed): AND HOW!
Hym "And how do you know... That THIS... Is not what the church is doing... To YOU? God you're dumb! How do you not see the parallel there? You are doing all this... And YOU THINK... That other people aren't already doing that... Except to you?"