Top Definition
In the days of sail, naval vessels mounted cannon carefully and purposefully rigged into positions which optimised the effect of their fire. Occasionally, the rigging of these very heavy guns might come loose, and with the vessel pitching about on high seas or during manuever in battle, the results for the ship and crew could prove catastrophic. The term has come to describe a person lacking prudence or insight, whose actions and/or speech jeopardises the safety of people in their proximity or under their authority.
Like a drunken bully, the politician shrugged off his advisors and taunted the insurgent forces operating in the country his armies were attempting to pacify. He had become a LOOSE CANNON.
by crowbone July 03, 2003
A wild one. Someone who does not conform to the rest of society. A maverick. A guy who plays by his own rules and to hell with the consequences. Shows you what he can do.
JC - Ladies, let me show you what I can do.

Ladies - Wow. That John Clegg is one loose cannon.
by The Strut October 12, 2004
A term of jealous criticism applied to individuals of rare flexibility and creativity, by mobs of petty-minded group-thinking procedure slaves.
They called me a loose cannon until one of my crazy ideas saved them half a million bucks. After that I insisted on being called a 360 degree swivel-mounted artillery unit.
#rebel #innovator #inventor #creator #individual
by Alex From Oz October 04, 2007
a very irresponsible person who is likely to cause destruction
How did such a loose cannon get into a position of authority?
#loose-cannon #loose canon #loosecannon #lunatic fringe #politics #religion
by The Return of Light Joker August 06, 2008
an individual who has little to no self control, does not think logically,whose grasp on reality is feeble. a seemingly misunderstood person who is in fact a walking disaster waiting to happen.
one loose cannon spoils the bunch.
by blockhead February 01, 2004
1. Reiju Chacko
2. A danger and liability to all surrounding human beings.
After his 3rd cup of double back diamond coffee and 2 red bulls, Reiju Chacko is a loose cannon.
#danger #loose #cannon #red #bull #coffee #caffeine
by The White Russian 007 October 21, 2011
1) Something the police chief calls two cultually different partnerd cops, when he is angy with them and when the police chief has "the mayor on his ass"

2) In an erotic gay movie about police: The thing that the police chief looks forwad too when "has the mayor on his ass"
1) "You two are loose cannons, but your damn good cops!"

2) "I like the two on your loose cannon, let's play good cop, bad cop!"
#police #cannon #homoerotica #buddy cop #government
by EmilioEstavezFan#1!!! October 08, 2009
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