1 definition by PHAT Betty

Top Definition
Engaging in sexual activity (usually intercourse) while under water . . . most commonly in a hot tub or bath tub but can refer to pools, lakes, ponds etc..
Joe and I went for a skinny dip at the cottage and it was such a turn on we ended up tub thumpin'.
by PHAT Betty November 06, 2007
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.