"low-key" (not in the typical usage, but the way it's being used now days)
Example:
Well, she's going out with him now, but lowkey I still like him and it bugs me.
(and I usually see it spelled as one word).
ETA another one:
PROLLY
As in, "I'm prolly gonna get a D on that test."
I can't STAND when people actually think the word is "prolly" instead of "probably"! Makes me think of "prolly want a cracker?"
