The act of hanging out the passenger side of a car, with a bat, and hitting roadside mailboxes while another person is driving.
1. "We played mailbox baseball last night, we broke the shit out of a bunch of mailboxes."
2. "This road had a lot of mailboxes on it, it would be great for mailbox baseball"
by The Dark Avenger April 15, 2003
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Going around a neighborhood and stealing mail from mailboxes to sell someone's information online or to find credit cards, checks, gift cards, greeting cards with money, etc.

Mailbox Fishing is a federal offense that is punishable by imprisonment.
Someone was mailbox fishing in my neighborhood because I'm missing very important mail that I should have received last month.
by Legend1999 March 1, 2019
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A sexual position, the female participant is in the doggy style position. The male participant (Mailman) aproaches from behind and enters into the anus, quickly withdrawing and then immediately entering the vagina. Thus he dirties up the mail and then delivers it.
That hoes quiefs smell like shit, she must have gotten a dirty mailbox.

I hooked up with my ex and gave her the dirty mailbox, I hope she gets a yeast infection.
by dego dis way May 10, 2006
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tiny dog that yaps and tries to bite you and won't shut up. the idea is that any dog that can fit in a mailbox should be classified as a rodent. yapping is suggested in order to meet mailbox dog standards, but not required. see also puntable.
"that would be a fun bike ride if it wasn't for that f---ing mailbox dog at the end of it"

"yeah, that dog is such a puntable"
by angus bohanon July 1, 2006
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Knocking boots on top of a mailbox. The act is particularly disrespectful to the owner of said boots as well as a federal crime. It can be used as an act of revenge or as an erotic way of expressing one's affections.
Man, that girl is so hot I just wanna bang her on a mailbox!

or

In order to right the wrongs in his life, Greg was later seen banging on a mailbox.

or
That guy messed with me and the only way to get him back is to bang his girlfriend on a mailbox.
by Nick @ B3YOND! March 7, 2009
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