noun
boo
An affectionate name for a romantic partner or loved one.
She calls her partner boo as they settle onto the sofa.
Etymology
Probably an affectionate alteration of beau, “sweetheart.” The exact development of the slang form is uncertain.
More examples
- He saved a seat for his boo.
- “Thanks, boo,” she says after receiving the flowers.
- The message begins, “Good morning, boo.”
Forms
boo · boos
Similar words
- sweetheart
- A familiar affectionate name without the same slang register.
- darling
- A broader endearment for loved ones.