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1.
a circle of people making crab gestures in a pool while chanting 'crab circle'
We like to fuck around and do crab circles in our free time
by itsalexbitch December 10, 2011
 
2.
Circular areas, on or around the lips that infested with crabs (pubic lice)
"AH STAY AWAY YOU GOT CRAB CIRCLES!"
by bolar November 07, 2009