Dahhh say that shit basically means just kidding.
Here's an example:

Man I fucked your sister the other day, Dahhh say that shit.

Hey bro I'm about to vote for Donald trump, Dahhh say that shit.

Man I'm a crip and a blood, Dahhh say that shit.

Man she ugly then a hoe but got a fat ass, Dahhh say that shit.
by Skurrr214 September 28, 2015
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Friend 1: This is your 5th time smoking today, you need to cut down or you'll be come stupid as hell.

Friend 2: Dahhh!
by riversidelawn June 4, 2021
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Guy1:Dahhhh
Guy2: what?

Guy1:This homework is to fucking hard!!!
by Dahhh man October 3, 2017
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