It is a polite way of saying Cluster Fuck when you can't say Fuck. Mostly used in normal speech in front of parents, small children, clergy or PC co-workers.
"Oh man, that 17 car pile up on the Beltway was a huge Cluster. I had no idea when or if I was going to get out of it alive."
by SusanHunt September 18, 2005
 Get the Clustermug.
Get the Clustermug. It is a polite way of saying Cluster Fuck when you can't say Fuck. Mostly used in normal speech in front of parents, small children, clergy or PC co-workers.
"Oh man, that 17 car pile up on the Beltway was a huge Cluster. I had no idea when or if I was going to get out of it alive."
by SusanHunt September 18, 2005
 Get the Clustermug.
Get the Clustermug. by JJA December 22, 2004
 Get the Clustermug.
Get the Clustermug. To text excessively or to offer pictures with minimal clothing, often ending in no reply or an awkward moment of confusion.
Yesterday I was doing my homework, when he started to cluster me, I have a boyfriend, so I didn't reply.
by Real4lyfe21221 December 16, 2010
 Get the Clustermug.
Get the Clustermug. by Bastardized Bottomburp May 21, 2003
 Get the Clustermug.
Get the Clustermug. A dirigible-shaped turd conisting of a number of pebble turds stuck together.  Contrast with globular cluster which lacks the well-defined shape and more resembles a chocolate peanut cluster.
The dump I took this morning consisted of three slimers, a cluster, a globular cluster and a cloud.  Man, I lost weight with that one.
by Mel Biggs August 10, 2006
 Get the clustermug.
Get the clustermug. by Spaz De Kat January 14, 2009
 Get the clustermug.
Get the clustermug.