When you do something socially unacceptable because you forget that there are people around. This is anything dumb that you would only do when you're alone, except you do it in public for everyone to point and laugh at you.
Scratching your balls in public is an example of skipping the flump
Person 1: Dude, stop scratching your balls in public
Person 2: Sorry, i just skipped the flump
When you single-handedly are able to do incredible feats of humanity with very little thought or effort.
These could include but not limited to:
Awe Inspiring Parkour Vaulting over railing
Mind Boggling Quote Creation at 3am
Intense bouts of gaming for 8 hours straight
Discord Mod - Wow I just got Iron III after 25 hours by slipping a Sean