If you're in a relationship, it's not unusual to give your partner nicknames, including but not limited to: bae, baby, my love, boo, sweetheart, etc. Turns out these pet names aren't just cute (even though, okay, some might sound silly), they can actually be a super important part of your relationship.
"Bae," Urban Dictionary says, is an acronym that stands for "before anyone else," or a shortened version of baby or babe, another word for sweetie, and, mostly unrelated, poop in Danish. In addition, "bae" has appeared in rap songs and countless web memes since the mid-2000's.
Some guys go the "classic" route with names like "angel," "darling," and "sweetheart"; some prefer food-inspired nicknames, like "cookie" and "cupcake"; and some straight-up worship their partners with loving names like "queen," "goddess," and "light of my life."
Pumpkin, peanut, bubby, baby, babe, bae, honey, darling, sugar, sweetie, honeybunch… English is packed full of fun, creative, and cute nicknames to call your loved ones.
Usually, if your S.O. is calling you babe, it's probably because they care about you or are speaking flirtatiously with you, and, as Sullivan said, calling you by your name might not get that across at the moment.
The short answer: Though this word was used in the 1500s to refer to sheep sounds, today bae is used as a term of endearment, often referring to your boyfriend or girlfriend.