It stands for WhamBam as in the WhamBam improv jam held through Second City Hollywood weekly. It is used in the chat section of as a form of acknowledging humor or skill.
Weekend bitch
Typically used to describe a person, one hooks up with on weekends.
A difference in status is implied when using this term.
Rub my feet, wb, it’s weekend, bitch.
Usually on snapchat stories people will use “wb” meaning will blank which means they wont answer text
Watching tv, wb
Out now wb