Someone who is (or tries/works very hard to be) the most popular person on the forum or message board they frequent. Often, the Net Cack will attract other Net Cacks. It's easy to spot a Click of Net Cacks, because they often all stick together on every subject, attack people together - as a group, tend to have this energy of 'inside joke' in their posts, and/or are rude, obnoxious, stuck up, ignorant, and verbally abusive.
The Net Cack is usually quite unpopular in their real life, has very few real life friends, is hard to get a long with, and generally unhappy.
Often, the Net Cack is also morbidly overweight, and/or has a hideous appearance, leaving them with little opportunity to work their way up the social ladder in the real world. Thus, bringing them to the Internet, where everyone has the chance to be SOMEONE.
The Net Cack is usually quite unpopular in their real life, has very few real life friends, is hard to get a long with, and generally unhappy.
Often, the Net Cack is also morbidly overweight, and/or has a hideous appearance, leaving them with little opportunity to work their way up the social ladder in the real world. Thus, bringing them to the Internet, where everyone has the chance to be SOMEONE.
I was really enjoying that particular message board, until the blasted Net Cacks started taking over.
by anonymous June 6, 2005
Get the Net Cackmug. by S@Y December 9, 2008
Get the North Cackmug. An adult female with braces and a face like a gremlin, who you are afraid might try to suck your cock in your sleep.
by PhuzzyLogic July 12, 2009
Get the cack gnabblermug. by Juan Epstein June 11, 2006
Get the horse cackmug. by Beacon Hill Low Life July 23, 2002
Get the cack passengermug. It means an awkward or inept way of doing something; originally meaning left handed, stemming from cultures that use their right hand to eat and their left hand to wipe their behind.
by The Acid Drop Kid November 4, 2007
Get the cack handedmug. 
Get the ball-cackmug.