Cluster Fucking 

To drive on a busy freeway in close proximity to other cars, ignoring the multiple open lanes. Usually entails drivers clustering to the right side of the freeway while two or more left hand lanes are open, causing a dangerous and just stupid scenario at high speeds, greatly increasing the probability of an accident, which is usually caused by one person hitting their brakes, getting rear-ended, losing control of their car. This process repeats for the car that caused the rear-ending, as he/she is then rear-ended, and this goes into a domino effect of destruction, chaos, and sometimes death. Which in some circles, is recognized as Traffic Darwinism, as the less intelligent drivers are sometimes killed by their own stupidity.

Other definitions:

A dense orgy of more than three people where positioning movement is difficult. Often consists of double penetrations and more skin touching than air.

WTF is up with these people! Get out of the way! Look at all that freeway over there! Bunch of cluster fuckers!

I almost got hit by 3 cars on the freeway because all these idiots kept on cluster fucking the road!

Sally really knows how to cluster fuck! I didn't know there were that many places to put a penis!

Cluster Fucking by notstoppingtohelp February 24, 2010

clusterfucking 

1 the act of unorganization of some sort
2 (clusterfuck)an unorganized group of people or things

1 they are just clusterfucking around up there.

2 its just a big clusterfuck on my desk

clusterfucking by the clusterfuck king June 12, 2004

clusterfucking 

too many people not enough brains

with the whole office in on the project the clusterfucking began

clusterfucking by Jester December 24, 2002

clusterfucking 

An orgy, sex en masse

It was a room full of people fucking, one giant clusterfuck

clusterfucking by Anonymous December 21, 2002

clusterfucking 

hanging out with friends, huddling in close proximity

we all started clusterfucking to keep warm

clusterfucking by Daria December 17, 2002