Term used to describe the visible part of a thong on a chick's butt when worn with low rise pants - resembles a whale's tail. (I say chick because I don't want to see a guy wearing this.)
That whale's tail really accentuates her ass!
ayon kay Kyndria ika-11 ng Enero, 2006
2 more definitions
The top portion of a thong that sticks out over the back of the pants when a female bends over.
"Maria's drunk ass fell on the floor clearly displaying her whales tail."
ayon kay l3lizz4rd ika-01 ng Hulyo, 2005
When your poop is so long that the bottom tip sticks at the bottom of the toilet and the top end falls forward and slaps your testicles. Imitating being slapped like a whale's tail.
Trevor called me during dinner to tell me about his comical whale's tail. It was a Whale of a tale.
ayon kay jcshfr ika-31 ng Hulyo, 2005