I have never heard that word before, but I can still understand what it means. It's a portmanteau word that combines "advertising" and "blasting." At least in the U.S., the sound in television commercials is usually louder than the sound in TV shows, so when a TV program ends and a commercial break starts, it feels like you're suddenly being "blasted" by the loud volume. I would not recommend using that word in any formal setting because I think it was invented by someone as a kind of joke.

it means when a commercials audio is much louder than the program that you actually want to watch's audio. cowboy...

Never heard of it, but Jamey's explanation makes sense. We have the same problem in Australia too.

(in)advertently blasting someone in the face? :P just kidding... :P