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To make a simple mistake on a master copy of something, thereby screwing up every subsequent edition. Every fruit of the poisonous Steffen tree has to be gone through line by line to ensure that the mistake is corrected.

Other renditions of Steffen include: steffening, steffened (past), steffen up 2: the SKUs, the steffenation, and steffen 2: electric boogaloo.
Aw, shit. I have to go correct a metric fuckton of work because I steffened the original copy.
Steffen by funstar September 1, 2010
Steffen is an complete unsocial awkard "thing" to be around.
He goes to a rich white boy school, and loves being a nerd.
Bad skills with ladies in general. THINKS he can dance... but usually shouldn't bring up this subject cause he tends to dance randomly in public.
hey nerd come over here, and stop being such a steffen.
nah aint got the ladies.. just been a steffen recently.
guy1 "hey can you help me with my homework?"
guy2 "man why cant you be more like steffen?!"

"stop dancing around like steffen"
just stop being a steffen and ask her out already"
Steffen is sooooooooooooooooooooooooooooooooooooo sexy and mine bitch
Steffen by 1243mil May 20, 2018
Gud af skrald og depression
Jeg ber til Steffen at jeg ikke får en bøde for at smide plastik ud i mad affald
Steffen by kronos the myth August 22, 2025

Steffen's mum

The act of ploughing a norweigan lady seven times in one night.
Yo, I steffen's mummed that norweigan girl lastnight
Steffen's mum by norweiganluva December 9, 2008

Steffen Cullum 

Steffen Cullum is strong and hard working, sexy and funny. Steffen Cullum will do anything to help a friend, always mature when needed to be.