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Inbox can be used as a verb, mostly on Facebook. To inbox someone is to send them a message to their message inbox - simple as it sounds.
On Facebook wall posts

Person 1 "Why is my life so awful?!"
Person 2 "What's the matter hun?"
Person 1 "I can't say on here, I'll inbox you"
Inbox by Urbananas April 21, 2010
transitioning from the popular sexual terminology coined by the construction industry (ie. nailed, screwed, hammered, banged etc), hi-tech nerds have one of their own:

a reference to a woman's vagina
Doomf8One: "Did you pass Doom level 41 last night?"
hellaUCLA: "I didn't play- I was at my girlfriend's place last night and her Mac sucks!"
Doomf8One: "ROFL! That's lame"
hellaUCLA: "It was cool- I was in her inbox all night instead!"
inbox by dr. mambo August 30, 2005

Inbox Zero 

When you have no messages in your email inbox. Such a goal is often elusive, because the more email you clear out and reply to, the more new messages come in.
I reached my goal of inbox zero by Friday afternoon, but Monday morning I had 42 new messages.
Inbox Zero by herzogbr June 19, 2009

Inbox me 

A person who is too stupid to use the word 'email' or 'message' and simply refers to the folder the message arrives in, rather than the method of transportation.

If you see or hear someone use this phrase, it is best to remove all technology from that persons zone of influence and prevent them from using it again. Cutting off their fingers is extreme but may well be acceptable for the good of humanity as a whole.
"If you know this guy please inbox me." "I'd rather troll you first if that's ok? And link Urban Spoon whilst I'm at it"
Inbox me by 0s1r1s February 10, 2015

Inbox Me 

Phrase used by those too stupid to say "email" that don't know the difference between a noun and a verb. An instant indication that you are dealing with a moron.
"Dude, inbox me on that later." "Never mind. I don't want to know you".
Inbox Me by John Berry Hobbes February 2, 2015

inbox rot 

To neither accept, nor decline a friend request from someone on Facebook or Myspace. Used in situations when you don't want to accept someone's friend request, but you also don't want to be rude by declining them.
Dude, that asshole friend of my girlfriend just sent me a friend request on Facebook. He's getting the inbox rot.
inbox rot by WHUDDDUP March 8, 2009