a women with large sagging breast,who can knock someone in the face with them.
as her breast were exposed, she was slapping/mailbagging her mate in the face/or head.
by kk1302 September 6, 2008
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when during a sexual encounter, a man inserts his balls into his male partners ass. the male on male equivalent of "Dog In a Bathtub"
With the way he's been walking, I think Jay has gotten the mailbag one time too many from Bill.
by El Guapocito March 31, 2009
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n. An RPGClassics feature started by Macc Maverick, continued by Cidolfas, then taken over by the Mailbag Team (Megaman984, Kagon, Skankin Garbage). Allows readers to send in replies to topics, a feature which makes up the bulk of the Mailbag. It is well known to never be on time. Ever.
The RPGC Mailbag is never on time.
by Anonymous June 22, 2003
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A sexual act in which 200 men form a circle around a woman, coming into a mailbag one at a time until the bag is filled with the sperm of every man. The woman in the center of the circle is then hit in the face repeatedly with the bag.

An alternate form of this act is called the Massachusettes Mailbag "Charleston Chew," in which the man who hits the woman with the bag proceedes to shit into the woman's mouth.
Henry wondered why Sally wasn't at work, but then he remembered that she was still recovering from that crazy Massachusettes Mailbag on Sunday.
by Scottimius July 23, 2006
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The mailbag in which a multitude of males have ejaculated in, which has the sole purpose of hitting a female across the face with said bag.
I was hanging out at the post office but had to leave after getting hit with a Massachusetts mailbag
by I am a mailman I know March 2, 2017
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