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1. BBM
Black berry messenger (noun)
To black berry message (verb) can be used "to bbm"
An instant messaging application on blackberries where you can see if the message has been delivered, when it was delivered and if the person has read it.
Alissa: Hey I bbmed you yesterday and you never answered!
Me: Oh, I never got your bbms.
Alissa: Yes you did! Dont lie, I saw on our conversation that you received them.
Me: crap, I wish i didnt open that damn bbm

Ex: She doesn't ever answer my phone calls, she only responds through bbm's.
2. BBM
To send a message to someone VIA BlackBerry Messenger. It could be a message using text, or could include a voice note as well as a picture.
"Did you get my BBM?"
3. bbm
blackberry messaging.
My sick blackberry curve that i got from blovi. Blovi used his blackberry to get a bbm from Kevin.
4. BBM
Boobs to Body Mass index. The size of a females boobs compared to the size of her body. Therefor a girl with small boobs can have a large BBM if the girl is small also.
Dude, that chick might be small, but she has a massive BBM.
5. BBM
— noun {bee bee ehm}
1. acronym for Big Bowel Movement;
2. really lame and annoying hipsteresque ad campaign from RIM, the makers of Blackberry to brandize their own instant messenger app.

— verb

1. to discharge waste from the body through the anus
2. to clarify or remove impurities from (a solution, esp of sugar)
On his cross country trip, John had to pull over to the side of the highway because he couldn't wait to get to the next rest stop 30 miles away to go to find a proper toilet. His choice was to take a crap behind a tree or take a BBM in his pants.

Sally bbmed to her boyfriend Stewie that she "just BBMed big time. Boy that enema did a number on my colon."
6. BBM
BlackBerry Messenger. A messenger just like Windows Live Messenger, but with a fancy name, although Windows Live Messenger offers much more features such as webcam, video calling etc... Yet BBM is a handy tool to get you killed on the road while driving, to the extent of distraction and addiction it offers.
Person 1: Hey, wheres Jimmy? Haven't seen him in a while..

Person 2: Yep, he's long gone. Got BBMed on his way to work..
7. BBM
B**ch Blow Me
guy 1: BBM!
girl 1: SCREW OFF YOU JERK.