Blah is defined as a belief of complete emptyness in Instant messages like AIM when its really full of emotions that the individual is afraid to realize because they feel that they need to hide their emotions because they dont feel its right to say them at the time; or the fact that they might have hid it from themselves for what they felt was their own good
John: So what do you think about me right now as more than a friend?
Elizabeth: Uhhh; Blah. . .
John: What is that to mean?
Elizabeth: Nothing at all it means its i dont know what it means
Elizabeth loved me the whole time just hid it from herself
Teacher: Whats the answer to number 5, Matt.
Matt: Blah
Teacher is writing on the board in math class, room is filled with silence. Because words have failed the young students, a lone peer named Keith states the immortal term aloud "Blah!!"