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.
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.
by ShaggyDishu June 2, 2019
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