I was excited to say the F word to my mother.
Why did you think you should say that to her?
It's funny and the moment was right.
I understand you may have thought that it was an appropriate time to say it.  However, it's pretty much always bad to say the F word, especially to your mother!  You should apologize for your language.
No, I am genuinely happy that I finally got to say it.
I know that using foul language can be exciting but it's rude. Think of how your mother must have felt being cursed at. It's best to limit use of such words.