username downvoting 

When someone down votes a post, comment, or definition (in the case of Urban Dictionary) regardless of the post and judging only by that person’s username.

Look at my username. Doesn’t it make you want to try username downvoting?

username downvoting by Biden is a dick April 3, 2021

No Username Here 

Also Known as nun, A scary shitlord who terrorizes anyone in his way with references of incest, rape, sex, porn, beastieality, and whatever is in his power. Also the agent (as of Sunday June 6th) of the Nate is lame amino, and is a better guitarist than Pemma.

Oh fuck oh no it’s that fucking No Username Here again get the fucking gun honey

No Username Here by NoNunNameHere June 9, 2019

set username placement 

when the government uses the first name of a person only for their college e-mail address to signify that they are well thought of and they use only their last name to signify that they have good character

USC used a set username placement for our students.

set username placement by Coop Dupe June 15, 2018

thlos username 

Roblox users who have the same overused 5 last letters to their name, thlos. They use it to flex their skill (mostly in LSB2)
and they're all over level 100.

Oh hey, look at those players whose thlos usernames.
guy 2: yeah they're edgy as fuck

thlos username by susmogus March 2, 2021

og username 

people who dont know what to do with their money and they buy a instagram username for thousands of dollars

hey man! i just bought a og username

og username by rottin June 26, 2023

Hi I don't use the taenun username at Urban Dictionary.

Hi I don't use the taenun username at Urban Dictionary.

Hi I don't use the taenun username at Urban Dictionary.

Hi I don't use the taenun username at Urban Dictionary. by Kmqq April 21, 2023

what's your username? 

What the BOFH asks when he wants to kick someone's e-ass. See what's your IP?

Luser: My account is empty!
BOFH: What was your username again?
Fish. Barrel. Shotgun.

what's your username? by fizzle April 15, 2004