the kid who always leaves something at someone's house or always gets lost, is always wrong, screws up under pressure or absent mindedly does something such as walk into a wall or a pole, also known to have strange "blank" habits.
Example: He is such a Blank!
I Blanked out and forgot to pick up my sister!
When you see a person you know on the street, and they see/recognize you, but pretend they didn't and look away in order to avoid talking to you. Usually results in an unnatural looking facial expression.
Laura: Dude, I saw Russel today, but he totally blanked me.
Meag: Really? I thought you guys were friends?
Laura: Yeah, me too. I guess he just didn't want to talk to me.