Too many guys at any social gathering, ie, Bar or Party, upsetting the guy to girl ratio that must be upheld.

dubbed at Cafe d'Epoque | Mont Tremblant Nightclub on a friday night.
"Man, this place is a fucking dude swamp, lets get out of here!"

"The only chicks in this dude swamp are attached to dudes faces"
by Redhat- March 2, 2010
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