They were trying to tell you to
Short Hop Fast Fall to land the First Hit of Neutral-Aerial which will combo into the Knee of justice.
Phew. Wasn't that a mouthful? But damn is it worth it for the true combo!
There are actually quite a few shorthanded phrases that have been developed for Smash over the years. I've tried to come up with a not-quite-...
There was a Reddit thread some years back where the community discussed this, and the most-upvoted explanation given was:
In sex, the thrust is presumably the strongest. That is why a sex kick is stronger during the first few frames.
A reverse sex kick (Dr Mario) is basically just saying that the man with a PHD prefers to go hard after the thrust.
It's a ...
Jigglypuff had this feature in every Smash Bros game, not just Brawl onwards.
It has never been officially explained why this features exists. I don't think we'll ever get an offical reason as to why, but hypothesised reasons include:
She is the balloon Pokemon. Her shield breaking is akin to a balloon popping and resulting in the balloon's loss of life.