Not!
not
An interjection negating the statement one has just made and thus rendering it sarcastic. Oh, yeah, I love getting a ton of homework on my birthday weekend. Not!
Farlex Dictionary of Idioms.
Not!
interj. Not really so! (A tag phrase added to the end of a statement, changing it from affirmative to negative. There is usually a pause before Not!, which is said on a level pitch somewhat higher than the sentence that comes before.) Of course I’m going to pay $100 a ticket to see a rock concert. Not!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
not!
See i don't think so.
The Dictionary of Clichés by Christine Ammer
- not
- not (oneself)
- Ooh, get you!
- my bloody oath
- bloody oath
- oath
- bonus
- Bonus!
- oh really
- Oh, yeah?