Could someone explain the demoman "bop" to me?

And then maybe give me some tips on the second jump in the video (http://www.youtube.com/watch?v=bFG1m4VzHVM) that Jaeger included in his post (http://commforums.com/showpost.php?p=26231&postcount=33) in the Countering Badland's valley rush thread? I hit the sign every time and then lose that extra half second of setting up stickies//getting into position. Am I getting to vertical in the sticky-jump? Do I go more horizontal and spam my jump key? I have tried both, but I am still having trouble.

Bop... are you talking about hitting (bopping) the roof accidentally on a jump like the 2nd blands one, and slowing yourself down?

As for that jump, if you hit the roof, you should be jumping further from your sticky. If you're hitting the lower set of stairs, you should be jumping closer to your sticky. The best explanation I've found on this set of jumps is boogie's (http://www.youtube.com/watch?v=KYKr0Aqcw7M), and as he says, it basically comes down to practice. hurtme -999999 and go at it until you get it right, altering what time you jump to figure out when you're going too vertical, when you're going too horizontal.

Yes, I never make that jump without hitting my head.

I'll try when I not at school. That video should help a lot with sticky placement.

Thanks.