To blackberry message while intoxicated.
1- Usually when a blackberry messenger (bbm) is abused after consuming excessive amounts of alcohol. Common bbmwi's use many of the animations, consist of embarresing, or down right ridiculous things.
2.Modern day "drunk dial" for blackberry users, and abusers.
"Oh my god, last night i totally bbmwi. I told tina she was hot!"
"WTF. NO MORE BEERS WITH BLACKBERRYS."
"Please, dont bbm me. I get enough bbmwi's from you anyways."