Definitions

1. interjection

an exclamation to express surprise or excitement, typically imitating the sound of a sudden release of air

“She let out a loud ‘sp’ when she saw the surprise party.”

2. verb

to burst or release suddenly, especially with a hissing or spitting sound

“The balloon sp when the pin was removed.”

3. verb

to spit or scatter something, often in a sudden or forceful manner

“The cat sp a hairball onto the carpet.”