Mav

This term originated from a character named "Mav" who was very well  known
for accidentally saying things, sending tells or pages or speaking on a
public forum something meant for someone else...like a mischannel or
replying to the wrong person.
MAV (v) - an act of miscommunication

Where it comes from is not certain exactly, but there are 
two theories.

The first holds truest, and thus is accepted as the true 
reason though. The second may be nothing but mere 
speculation, or a common application of the first.

 -The Legend Of Mav-

Mav was a player on tinyMUCKs, and most often known 
around fluffymuck and furrymuck.

Mav had one small problem. That of placing a colon before 
typing fairly often. The result? Whispers and Pages 
became public shouts or shouts. Thus informing the wrong 
person, or everyone around, what was meant to be told to 
another player through private conversation.

And so the name of Mav gained the meaning of a 
miscommunication. To 'MAV' was to mistell, miswhisper, 
shout, or other such by accident. The meaning of the verb 
has since changed to include making any 
say/whisper/page/pose typing confusion.

Example: Mav shouts "I love the moment when I have worn 
my underpants long enough when they just suddenly feel 
like they are a part of me." (Public-shout)

(yes, that was really said by Mav. Intentional or not, 
who knows?)

The other possible origin (though it is rarely belived. 
Nearly everyone agrees with Mav being the originator) is 
from military use. To 'MAV' Is to use a 'Mis-Appoprated 
Verb' - i.e. a communications mixup. Most likey this was 
adopted after Mav was coined, and just given a spiffy 
acronym.

This 'accident' was so common that it became known as a 'mav'...and though
the character mav hasn't been around for a while, nor even the muck where
he was on...saying "whoops, mav".. or "mav" still means to this day
accidentally saying something in the wrong place.