I have a bunch for a lot of different games, but since the easiest ones for me to remember are Smash ones:
Waltzing - The motion of quickly walking back and forward as Marth and gaining forward distance thanks to Brawl's "unique" physics engine. It's called this since it really does look like Marth waltzes across the screen.
Tipped/Tippered - Simple. Getting nailed under the best possible situations with either Marth's forward smash, a spike after an aerial wobbler, or receiving a neutral B in the Phantom Hitbox.
Wobbler - Movement where the player quickly and almost unnoticeably shifts their momentum back by a bit, most often used when trying to start a pivot attack or in the air to catch someone returning from off screen.
Pivot attack - While running in one direction, tap the other direction and as the character's turning around animation begins, shorthop then front air (which at this point turns into a back air). Fox, Marth & Lucas all become more dangerous with this technique.
Cape Glide - Running off the edge of a stage or platform as Mario then using the Forward B (Cape) and your forward momentum to launch yourself off towards the distance. Catching someone returning to the stage with the cape while doing this is referred to by my sillier friends as "Getting Superman'd" or "Bugs Bunny'd".

Phantom Hitbox - The absolute edge of an attack that is possible to connect with. Sparks fly when you've barely missed this. This is referred to as nicking.
"Super Metroid-ing" - Playing a ridiculously good Samus. Can also be referred to as Sakurai/Smash Breaking.

Then here's a quick SMB3 on for ya:
Singin' in the rain: Short jumping and running through an entire level at full speed.
Finally. YOU SO PRINGLES. WHERE YO CURLY MUSTACHE AT?