I’ve been hearing “alien technology” being thrown around quite a bit recently… 
It’s just funny… XD
Most of the ones here I’ve heard already (Mexican Uppercut is just hilarious, I remember seeing a gif of that somewhere XD)…
O-O~
R.Kelly’d= getting Perfected on.
Notice the “P”
Clutch isn’t video game slang.
Our friends refer to this as getting 'P’ed on.
Two Boots = Cable j.hk or Alex boots.
Eat dirt = urien’s Spartan bomb throw or similar throws from other characters that lead to dangerous mixups.(from the FFA 3S ranbats).
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I call these dudes Oprah’s cuz every Winfrey (winfree)
Jumpers jumpers is a good one. Used to make fun of someone that just jumps all day. Can be used in many ways (dashers dashers, mashers mashers, so on).
Wait, wait. You’re just saying what they are, twice.
Yomi and FRAAAYYY!!!
KFC in MvC3.
Combos be extra Krispy.
Churning Butter - spamming 360 motions, trying to get a grab off.
Raiden Softban
stay free, that new technology, and America unblockables are my favorite. i also like YO UGH
I remember this one from the early days of SRK. 
Cable j.:hk: and Cyclops :d:+j.:hk: = Summers Family Roundhouse
lol.
Gen’s standing crane strong/fierce - scoops
T.Hawk’s typhoon - Campbell Soup (mmmm mmmmmmm!)[Credit goes to Huy for that one].
Seth’s jumping down mid kicks - Riverdance.
BBQ as shorthand for Baroque in TvC.
Someone who waits until you select your character to pick his and refuses double blind selection at a tourney is known as a COUNTER-DICK.
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I can’t believe I forgot my favourite one:
“Lay hands on 'em”
That sounds so sick.
Seconded.
On blast and salty are good ones. My friends and I like to scream “dagger!!” when we rob the other of a victory, such as winning with a pixel or two of health left.