pop the box 

a marching band term that the director yells when he is trying to get the bandies to point their horns to the press box. no one but the pit gets the double intondra

come on kids pop the box

pop the box by green fox June 30, 2005

Jack-in-the-box-pop-up-artist 

n., Someone who comes in and out of your life. There one minute gone the next.

You can never count on this person to be there when you need them. They show up when it's convenient for them, usually with a hidden agenda.

I.E. On the 1st and 15th, I can expect a visit from my favorite jack-in-the-box-pop-up-artist

Jack-in-the-box-pop-up-artist by TGDub September 1, 2009