Defensive ring of females in a dance club or lounge protecting them like inwardly-facing musk oxen against being hit on by any men. Then they go home at closing time and wonder why they never meet anybody.
Any male approaching this sea of backs will be boxed out. Should the male somehow pry a girl into conversation, her "friends" will reclose her inside the chick circle or take her to the bathroom, preventing her from meeting any guys or otherwise having any fun. They will go home and complain all guys are d-bags.
Look at all those frustrated girls in the chick circle. Wonder why they're all made-up and dressed up if they don't want to meet anybody, given they can get music and drinks in their own apartment.