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A comparative slang term that is used to indicate worthlessness in something. This term is a synonym of rat's ass, though it's slightly harsher(referring to a rat's vagina), less commonly used, and is known to be most often used by America's most loathed anti-gay fundie pastor Fred_Phelps and his congregation of similar-minded followers.
1."You jackass Swedes just don't get it. Once you have laws to chill Bible preaching, we don't give a rat's tutu whatever else you do or say. You are drippings from the Devil's own penis - a veritable sperm bank for Satan's queers." -Fred Phelps (to a few Swedes who sent him and his church photos of the Swedish royal family) BTW, this is quoted from his "church's" website.

2. Yay! Lots of beer for tonight's beirut tourn... whoa wait a minute, you bought us a few whole cases ofO'DOUL'S??!! You fucknob! That shit isn't even worth a rat's TUTU to drink! Now we really need to get into some gangsta shit with you for doing this to us!

Mark H. Over 1 year of Urban Dictionary contributions since last February(like anyone will give a rat's tutu? ;-) ).
by Mark H March 03, 2005
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