Top Definition
To engage in the act of female masturbation to an epic scale. A thunder fud can last anything from a matter of hours to an entire menstrual cycle.
"Lizzie I havn't seen you for weeks. Have you been having another thunder fud?"

"...yes."
by ian penn May 30, 2009
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×