Definition

Your person, your main squeeze, your romantic human security blanket—basically the one you're emotionally and romantically attached to. This term of endearment has survived decades of slang evolution and remains the go-to word for "this is the human I've chosen to tolerate exclusively." Short, sweet, and less cringey than most couple nicknames.

Example Usage

Can't make it to game night, spending the evening with my boo watching terrible reality TV.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Boo&defid=13664738)