I have been trying out this dumb skip for over 30 minutes and still can't figure it out.. And even better! There is no guides on it. Would someone help?

Do you mean the jump that skips waiting for the stairs to rise? That jump requires two things 1) SR50 which means just hold W+A/D in Unity port and 2) using the walls of the arena as they're coming down to get a little more height. If you're trying to do it after the walls have already gone down then it won't work.

No I meant the skip where the pinky helps you to go out of bounds. Here's a video of it:

i was thinking the same i saw the run a coule of days ago and tried it many times but i never did it or figured out how to do it

It's a bit tricky to nail. It's a void glide, with the pinky kinda acting as a wall. You need to get in the corner, and get the pinky in front of you to block you from moving when going through, then just kinda build momentum and pop through. It's very annoying. It took me about an hour to get this IL because I couldn't figure it out either.

Notice how Thief goes straight for the chaingun and stays on the wall and kind of slowly backs up on it to lure the pinky (Rng based). He does that for a chance at the pinky to start circling around to get in the right spot. You wanna make a little room for the pinky to be in between you and the wall. If you make too much room then it won't work. When the pinky is in the right spot in front of you, you wanna shoot him while you're moving to make room to get in the void. I've only done this trick on UV. It might help if you slow down the playback speed on the video so you can study their every move. I wish you the best of luck.