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nsidb stands for not sure if done before.
When someone makes a meme and post it online but he/she doesn't know if it's been already made by someone else so he/she adds a #nsidb in the caption.
This meme is made by me #nsidb
<Original-Meme-Image-Here>
nsidb by ShaggyDishu June 2, 2019
Related Words
nstid nitida notid NSAID nsidiou nstink NTID Natída Netidiot Notidiction
Non-steroidal anti-inflammatory drugs, usually abbreviated to NSAIDs, are drugs with analgesic, antipyretic and anti-inflammatory effects - they reduce pain, fever and inflammation. The term 'non-steroidal' is used so the difference between these drugs and steroidal drugs with similar properties is distinguishable.

NSAIDS are unusual, as they are non-narcotic.

Everyone has heard of these kinds of drugs, they just may not have known it.
Ibuprofen, aspirin, and acetaminophen are the most common types of NSAIDs.
NSAID by WWIII January 3, 2007

Netidiot 

Classification for people who incessantly post heated and insulting rebuttal messages in web forums. Nothing better to do than anonymously harass others online, it seems. A more productive use of their time would include thinking of ways to kill themselves. Instead, they submit volumes of circular text that always fails to make a point or debunk the original author’s statements with any validity.

The exchange can spiral out of control in a few different ways, usually after the original author responds to the comments. Often, the netidiot is incited by author’s reply, as though somehow shocked that someone they verbally assaulted would treat them with the same manner in return.

Most notable is the netidiot’s obvious emotional instability, and failure to recognize when they've been outwit and defeated. Remarkably, they always insist that any number of other posts that disagree with them are "stupid."
Who died and made you king of the netidiots?
Netidiot by Wes Ferguson July 6, 2005
stands for "No Shit There I Was". It is used as an acronym to recede a statement of incredible importance or incredulity.
NSTIW... when this guy ran a red light and creamed into the other car
NSTIW by BellJD May 5, 2011

Notidiction 

A form of addiction with the traits of frequently checking notifications and constant fear of missing out on texts, messages, emails, notifications and updates.
Hey Emmy, stop checking your phone every now and then, it has become "Notidiction" for you!

Hi, I am Emmy and i am a "notidict"
Notidiction by Mystery_M June 17, 2020
A gorgeous girl who is kind and loving. Loves her friends and is really happy with her friends at the moment. Nitidas care so much about others. If u have a nitida in your life ur so lucky
Girl 1: omg nitida is so nice she's like my closest friend
Girl 2 : I know
nitida by Grace beltch November 9, 2020