Definitions

1. interjection

an expression used to refuse or express denial, typically in a casual or informal manner

“He said nope when asked if he wanted to go to the movies.”

2. noun

a refusal or denial, typically in a casual or informal manner

“The nope from the customer was disappointing, as we were counting on their order.”

3. verb

to refuse or express denial, typically in a casual or informal manner

“She nooped the invitation, saying she had prior commitments.”