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u/ means username/ and it is used in Reddit and is well known in the Reddit community. People use u/ insert random name here to mention a random Redditor to tell them to get their butts onto a post or to show others who the person is. BE AWARE that when you mention somebody they can see what you commented that made them go onto the post
Anne: Hey Harry how do I mention a Redditor again I'm still new to this website, please help.

Harry: You just type u/ and then their Reddit names and there you go that's the dummy's guide to mentioning somebody on Reddit.

Anne: Did you just call me dumb?!

Harry: No...
u/ by u/welikeReddit1 January 20, 2021
Related Words
u • U.S.A • u r • u.d. • U.S.S.R. • U.S. • U.D.I. • U R Gay • u-turn • u.u
You
U
U by NiggaStoleMyBeans March 16, 2019
The letter "w" being mistyped by some Vietnamese dumbass forgetting to turn off his Vietnamese keyboard.
Ưhat the fuck are you doing? Your mom.
ư by hunghihihaha April 12, 2022
Shorthand for the word "you." Commonly used on the internet by those of low intellect, or those who are much to lazy to type a three letter word.
u cumn ovr 2day 4 anl sx?
u by -Drakken August 23, 2003
Tears of joy. This emoticon is used when you see or experience something that makes you cry happily.
00: "My mom just survived her cancer surgery and they say she'll be alive and live normally again! ;u;"
;u; by rtivey01 September 16, 2017
The twenty-first letter of the english alphabet.
If you didn't know that already, there must be something horribly wrong with you.
A B C D E F G H I J K L M N O P Q R S T U (see that? that's a U) V W X Y Z.
u by LykOMGurUGLY June 24, 2004
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Finding your way back to the truth by fixing on one verified fact and working out from there, the way you navigate by the North Star when everything around you is spinning.
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Andrew Tate has mastered the field of larpenomics
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