gramumba call 

The announcement at the begining of the evening, or upon first meeting a group of females, that one will "take one for the team" and attempt to hook up with the ugly girl in the group (there's one in every group), thereby increasing the chance that another member of your party will hook up with someone attractive. The grumumba call is the ultimate selfless act amongst good freinds - normally reserved for only the most desperate of situations.

Since Joey had been dumped by his fiancee the day before, Kevin made the gramumba call as they entered the club.

gramumba call by MidGeo September 20, 2006

grumumba 

an exclamation of victorious accomplishment used by males upon commencement of sexual activity with females. Most commonly used but not defined by penetration of said females anus. When used in most cases results in a slap and ending of sexual activity.

Or after a load is delivered to a female.

He shouted "grumumba" when he finally conquered her anus, followed immediately by a slap.

grumumba by MoleMolle November 5, 2009