Something one (usually a camp drip of a wimp) says when they've had enough of being fucked around with. Usually followed by racially motivated attack on a minor, perpatrated by said camp drip of a wimp. Alternate forms include "You need slapping down." and "You, my dear boy, are in need of a good spanking in the downward direction."
In the garage, Jordan calls Ben Mitchell a sap (he meant to say puff but Eastenders is supposedly "family viewing". Hah!)

Ben was pissed off, so much so that he could've even said Bubbly's in the fridge . But instead, Ben picked up the wrench menacingly and wailed "You need slappin dahn!" before opening the proverbial can of whoop ass on Jordan.
by Mons†er August 24, 2011
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She is a beautiful young girl who cares about everyone and takes care of herself: she is not afraid to try out new things and cares most about her friends and family. She is independent, fearless, witty with her comebacks, energetic, calm and collected. Dahn, usually a girl name, is very resourceful and is very practical.
Boy1- Wow, I think she's a Dahn
Boy 2- You're right, I think she is too.
by butterflybae333 June 1, 2022
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The cutest, most beautiful woman you will ever meet. She will steal your heart the moment you meet her. Dahn is a brunette with green eyes and very, very, VERY cute facial expressions.
Guy 1: I'm probably going to ask that cute girl out tonight
Guy2: She's such a Dahn
by butterflybae333 May 18, 2022
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