It means a device with which women rinse their pussy. So, quite rude. Pussy, idiot, asshole.

Ha ha! This is a pretty rude American insult, which, surprisingly has not become British English. I don't think I should define it myself other than to say it means a worthless or irritating person. If you really want to know try these links: http://uk.wrs.yahoo.com/_ylt=A7x9QfiSo.tNLmwAFgBLBQx.;_ylu=X3oDMTBybWpoN25zBHNlYwNzcgRwb3MDMgRjb2xvA2lyZAR2dGlkAw--/SIG=11nmos8s3/EXP=1307317266/**http%3a//en.wikipedia.org/wiki/Douche http://uk.wrs.yahoo.com/_ylt=A7x9QfiSo.tNLmwAFwBLBQx.;_ylu=X3oDMTByazUxbmZ2BHNlYwNzcgRwb3MDMwRjb2xvA2lyZAR2dGlkAw--/SIG=12claci0t/EXP=1307317266/**http%3a//www.merriam-webster.com/dictionary/douche%2520bag and [ this one is a very rude slang dictionary. I do not advise you to use any of the words!] http://uk.wrs.yahoo.com/_ylt=A7x9QfiSo.tNLmwAFQBLBQx.;_ylu=X3oDMTByNGxmazk4BHNlYwNzcgRwb3MDMQRjb2xvA2lyZAR2dGlkAw--/SIG=12e4kb1j4/EXP=1307317266/**http%3a//www.urbandictionary.com/define.php%3fterm=douchebag

'Douchebag' is American slang and is used to decribe someone (usually a male) who is a)considered to be a mean or rude person b) seen as being arrogant or obnoxious (especially just because they want to appear cool) or c) an excessively self-obssessed person. A very similar word is 'jerk'

It is an insult. It is basically equivalent to idiot. The literal meaning is a little less polite to talk about.

wow! thats a bad word. haha. who taught you that? haha. omg. well this is a tool women use to clean themselves. typically you can only call a "guy" this insult. no one calls a girl this. it means the guy is really a bad person, no ethics. like as bad as an ant you step on.