A situation where there are alot more females than males. Not always a bad thing. It's the female equivalant of a sausage fest. The name refers to the female reproductive organ known as a vagina or butterfly.
Unfavorable

Nikki: I'm gonna head down to The Stratus Club and find some guy to hook up with.

Callie: NO! Never go down there.

Nikki: Why?

Callie: Because, its always a total butterfly swarm. You would be lucky to even see a guy there.

Favorable

Nico: I'm gonna go try to pick up some girl at Stratus

Calvin: My boy was just there and he said its a total butterfly swarm.

Nico:..............NICE! Thanks for the tip bro.
by It Was Written July 06, 2010

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