I've always liked watching speedruns of SSX Tricky, but I began to notice something. Various runners are doing a trick that doesn't seem to give any points or display the trick name, but it does fill up a bit of boost.

Basically the runners quickly point the nose of the board foward and backward, and it makes the "tweak" noise. I've never seen this when I play or even done it on accident. Is this a trick or a glitch?

If you need an example, Kelecat does it during the giant fan pipe in Tokyo Megaplex.

Can you link a clip? That might help me figure out what you're describing.

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Sounds like a tweak cancel, you can do one by starting the tweak and letting go of the grab right when the tweak would start.

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https://puu.sh/wT3KM.jpg

Kelecat does it a lot in this video:

https://www.youtube.com/watch?v=WZuwUopAR_Q