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1.
The collective noun for a group of skanks, or just one extremely skank-like individual.
Eg. 1
Person 1: Oh god, avert your eyes! There is a group of extremely inappropriately dressed young ladies over there!

Person 2: Ahh, attack of the Shimmy Shimmy!

Eg. 2
Person A: Jeeze, I haven't had sex in about 4 hours!

Person B: Gosh, you're such a Shimmy Shimmy.
by Penelope Sidekick December 13, 2009
 
2.
tight, too sharpen, move
hey man can you shimmy shimmy on out of here
by The one whos name is not concered November 24, 2003