One who dilivers by the means of a post office, a dildo to a gay lover before butt sex.
Bob: Do you know why Abe sent me a dildo in the mail? That's kind of fruity.

Ron: Dude, you better hide or something. That fag's a dick mailer!
by JakE May 7, 2007
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Answering a question extremely quickly, especially a rather difficult one.

The term is named after the author himself, as well as an absolutely golden moment during Meredith Viera's time as the host of "Who Wants to Be a Millionaire?", where a contestant phoned a friend for $250,000, and said friend instantly told him the correct answer - Norman Mailer.
Contestant: "Bob, in 1960, what author stabbed his second wife, Adele, with a pen knife during an argument at a party?"

Bob (before contestant even reads any of the choices): Norman Mailer!

*Audience cheers*

(A few moments later, contestant locks in Norman Mailer and gets it right)
by Someone who kinda exists November 21, 2020
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Ryan: "Have you heard of XM9G? He is such a Typical Mailer!"
Archer: "I hate typical mailers!"
by Danorbis Skyrden March 27, 2023
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Someone who always uses the reply/forward box at the bottom of an E-mail,regardless how irrelavent the original mail is.
I sent Steve Martin this mail a month ago, what does new E-mail have to do with that? What a boomerang mailer this guy is.
by PeteyBarbarossa February 5, 2012
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Advertisments (Fliers) sent through the mail, that target the uneducated, lazy, poor, or basic low lifes of society.
We send out way to much trailer mailers to the trailer trash in Alabama, West Virginia, and Mississippi.
by buffalojay May 20, 2010
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Those who correspond with death row inmates. The maggot mailer is usually female.
Noora was Sean O'Brien's maggot mailer until he was executed by the State of Texas.
by Robertt November 20, 2006
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The mailing person who sends your emails back to you with a failure for no visible reason.
aaand, send. Not again! mailer-daemon sent it back once again!
mailer-daemon@googlemail.com: Message failed to send to <someone@example.com>
by Griggles October 19, 2020
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