All the other definitions are too confusing or overcomplicated. It's just slang for your significant other. No different than calling your SO honey, or babe.
Happy valentines day Bae.
Simple sweet word used by most couple who're in love and it's alternatively means the same as baby or babe.
Before anyone else (BAE). Your first love, so to speak.
She's my bae.
A creator who people don't find amusing but the internet finds the word as a compliment word as "Cute"
A:That girl is such a bae
B:she must be a horrible game creator then
This is what embarrassing losers call their significant other for some stupid ass reason. What it really does is make you sound like a brain dead retarded 10 year old that is trying to be cool.
Don't ever use the term Bae because it's not a word and it makes you seem like you are an idiot punk who just makes up stupid ass words.