What does bo mean?
Bo is an informal English noun used chiefly as a term of endearment for a boyfriend or male sweetheart, and more broadly for a close friend or companion. The word is essentially a relaxed, spoken form of the older French-derived "beau" — once a fashionable term for a suitor or dandy — shortened over time into a quick, affectionate two-syllable utterance. It is most at home in casual conversation, where it signals intimacy and easy familiarity rather than romance alone; friends may call each other "bo" much as they might say "pal" or "buddy." Because it is so strongly colloquial, it rarely appears in formal writing and is best reserved for informal contexts. Its brevity makes it a distinctive little piece of everyday vocabulary: a word that carries centuries of courtship history compressed into two letters, showing how language steadily wears down ornamental borrowings into warm, unpretentious expressions of affection.
nounA term of endearment for a boyfriend or male sweetheart; more broadly, informal slang for a close friend or pal.
- As a noun, a boyfriend, sweetheart, or male romantic partner.
- As a noun, informally, any close male friend or pal.
- Rarely, as an exclamation, a variant of 'boo' used to startle someone.
"She brought her new bo along to the family barbecue."
"Everyone at the party assumed the man beside her was her bo."
"'Come on, bo, you've known me since we were kids,' he said with a grin."
The plural is rare in practice, as the word typically refers to one individual at a time.
"Both sisters brought their bos to the wedding."
This two-letter word is really just "beau" — the elegant French loanword for a suitor — worn down by generations of casual American speech into something you can text with one thumb.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bo
Bo is generally understood as a colloquial shortening of "beau," the French word for a handsome man or suitor that was borrowed into English in the seventeenth century. Through regular informal use in American speech, the fuller form was clipped to "bo," retaining the affectionate sense while shedding its fashionable formality. It now functions chiefly as a casual synonym for boyfriend, sweetheart, or close friend.
Word family
Usage notes
Highly informal and colloquial, common in casual American speech and African-American vernacular English; it carries warmth and familiarity but is out of place in formal writing.
Don't confuse with
"Bow" is either a weapon for shooting arrows or a knot with loops, whereas "bo" is an affectionate slang word for a boyfriend or friend.
"Beau" is the formal, older term for a male admirer or boyfriend, from which "bo" derives as its casual modern slang descendant.