So I've heard of an exploit, can anyone confirm? Transcribed from a comment from TrappedInFallout's I got a perk at every level video:

Do a video about the VERY little known known exploit where you make a quick save right before you get out of good springs. You pull up your pip boy at just the correct timing right before the message pops up, and you know you got it if you see your arm with pip boy stuck infront of your face basically. So you’ll also notice you will be able to assign skill points and special before actually editing your character if you did this correctly. The exploit then proceeds to require you to select the skilled trait. Now once you are done and the original pop up is present once again, your arm should have went down a few inches maybe. You can repeat the rebuild multiple times, and as long as you got the original timing correct with the pip boy you can continuously rebuild while selecting the skilled trait each time. As you’ll slowly notice each time your skills stack and stack 5 points till you eventually hit 100 in all and/or your animation putting up the pip boy finishes.

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Update: Just did it and got my tagged skills up to 90s, and everything else to late 60s and early 70s.