a group of five people who believe themselves to be much better than the rest of their friends
a group of five residents of Porter Hall at Miami University call themselves the pentagon
by Abraham bin Laden December 04, 2008
a ho ejaculating five penis at the same time: one on each hand, one in the mouth, one up her pussy and one up her azz
yo that ho pulled off a pentagon in bathroom!
by Fat Choke May 22, 2003
A Sexual position involving one women and five men. While being double-penetrated in both the anus and the vag, the young lad must use both her left and right hands to jerk-off two males. The fifth male stands in front for the blowjob. The move originated in Green Bay, Wisconsin when a teenage boy named Devin thought up the brilliant idea for one of his friend's mom.
Desperate for some action, a group of men paid a local HONEY to do the pentagon with them for a few minutes.
by Melvin Dickerson April 11, 2008
The act of having sex with a member of the opposite sex from each branch of the military: Air Force, Marines, Army, Navy, Coast Guard. This can be done all at once or one at a time.
DW: Dude I completed The Pentagon last night!

BM: No way! I'm still need a Coast Guard woman to complete mine.
by aj garza April 20, 2008

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