Definitions

1. interjection

a sound of satisfaction or pleasure, often expressing excitement or happiness

“She let out a happy bb as she unwrapped her birthday gift.”

2. verb

to make a sound of satisfaction or pleasure, often expressing excitement or happiness

“The crowd began to bb as the concert started.”

3. verb

to emit a sound similar to that of a baby or a young animal

“The new puppy started to bb as it learned to make new sounds.”

4. noun

a type of metal detector, especially one used in prospecting for gold

“The prospector used a bb to search for gold in the riverbed.”