SDN 

"Super Duper Nice" is for a person who is really nice and kind

"You are so SDN"

SDN by TheJaylen August 8, 2025

umop ap!sdn

It's upside down, upside down...but without the 'i' mistake.

umop ap!sdn is the best thing since 5318008 on a basic calculator!

umop ap!sdn by Renegade0894 March 29, 2015

umop ap!sdn

It's upside down, upside down...

umop ap!sdn is the best thing since 5318008 on a basic calculator!

umop ap!sdn by Renegade0894 March 29, 2015

sdnfgljsadj,mkafoebnsd; 

when you are mad at something and you press random keys

Guy 1: Im mad.
Guy 2:How sad.
Guy 1:sdnfgljsadj,mkafoebnsd;
Guy 2: Huh

sdnfgljsadj,mkafoebnsd; by Splashcoaster December 10, 2014

SDNF 

Simply Do Not Fucks

Friend 1:This nigga is so fake, he talks shit about his boys and then tries to be chill with them the next day.
Friend 2: SDNF my g

SDNF by TwoSmoove December 4, 2011

SDNS 

Acronym for: Stop Drop N Skank

1)
A 7 piece punk ska band created in 2005 in the underground GTA (Greater Toronto Area) Ska scene. Includes two trombones, two guitarists, one trumpeteer and one base player along with a drummer. They have had at least one line up change since they were formed. They play very happy ska, simmilar to that of Streetlight manifesto. A pretty kick-ass band.

2) The practise of spontaneously bursting into skankin at the sound of ska music.

YO did you go skank @ the SDNS ska show last friday? it was fuckin kick ass skankin awesome.

SDNS by Saib0tx March 12, 2009

SDNC 

Straight Dick No Cuddle. Describes a hook-up in which you hit it and quit it.

J: Ooo so you hooked up last night? Aren't you worried this will screw with your friendship?

C: No worries love, it was SDNC, no strings attached!

SDNC by jujubee2731 April 18, 2010