Sausage fest

[PussyCat]

a party of only guys (or at least 80% guys), where there is a substantial abundance of weiner.

[Jessica]

When the number of males in an environment overwhelmingly exceeds the amount of females present.

[Dave Paprocki]

Where there is not enough buns for all of the hotdogs at a party

[Rihanna]

When there are no women present with a group of men.

[Tina]

an event or a place at which most of the people present are men, or a group that consists mainly of men: