Top Definition
United States Postal Service sanctioned mail consisting of advertisements that 99.5% of the population doesn't want, but they insist on forcing down the captive postal customers throats anyway.
Dang junk mail, there is so much of it in my box clogging it that I'm being driven nuts!!!
by Piranha June 09, 2006
Unwanted mail. Includes product advertizements and pornography. Especially applies to Internet mail
I have to check my email account every day to clear it of junk mail.
by AYB March 10, 2003
1. unwanted or annoying mail

2. uninvited email messages containing advertisments for unnecessary goods or services
I am sick of getting this junk mail.
by Light Joker March 12, 2006
When you receive an email with a picture of some random dude's dick or 'junk'.This is typically done to shock or embarrass your friends while at work, but random 'junk mailing' does happen from time to time.
"Ah man. Eddie totally hit me with some junk mail while my boss was at my desk. Now he thinks I'm into cock. I should have known it was junk mail."
by Chance2124 April 10, 2008
When one sticks their junk in the mail slot of someones door until someone sees it. Usually a sick prank
Person 1: Hey you know that barber shop down the street that Person 3 owns?

Person 2: Yeah.
Person 1: I totally junk mailed it while all his customers were in there.
by TuriGuiliano April 07, 2011
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