Ub 

1. When a teenage boy flirts and doesn't accept it yet he flirts with every girl that looks his way.

2. When someone flirts over and over again and denies it but then in a late night phone conversation starts to talk about how every girl exept for one are awesome at flirting

"hey where is alex?" "he is being his Ub self with that girl"

Ub by 1big2boi3 May 3, 2009

UB 

- Unidentify boy/ boyfriend
- The grey area between the vicious triangle of friendzone, boytoy, and boyfriend

He's more than a boytoy but we haven't establish a title yet... So he's a UB.

UB by La Flonda October 25, 2015

ub 

That one BITCH who plays every boy! The ‘ub’ stands for unwanted bitch because everyone hates her. All her exes wish she was dead and hate!

Omg! That’s the girl everyone says is an ‘ub’!

ub by Jeff the G May 29, 2020

UB 

Ugly Bastard. Found commonly in hentai.

UB = Discord Moderator

UB by Somite December 1, 2020

UB 

Ugly Bastard. Usually, a tag found in hentai. Also another word for Discord moderators.

People who are into UB are UBs themselves.

UB by Somite December 1, 2020

UB 

Unsoundness Bug. (software engineering lingo on technical community such as GitHub)

Does code that this PR(pull request) changes contain UB?

UB by scccc January 30, 2021

UB 

An ubercode

"I need to scan your UB"

UB by Defining English September 7, 2021