I'll start with the most obvious one: "gay" as a bad thing.

bad thing happens in vidya

"That's so gay." :le-pol-face:

"Ur mom gay" :heated-gamer-moment:

I rarely see it used that way anymore, except on some older online shooters, and even there, if you call it out, there's a good chance that they will get mocked as the boomers they are.

I really hated when "epic" took off as a slang term.

"I eat le epic bacon with every meal! Thanks for the Reddit gold, kind stranger!" :so-true:

"Obama is falling behind Hillary in the primaries! Epic fail! It's Her Turn!" :maybe-later-kiddo:

Now it's mostly used as a stand in for something stale and lame, and I'm all for that.

This last one is apparently fully dead and I'm so very, very glad: "wow" as an incredulous sarcastic remark toward an unwelcome event or situation, usually followed by "seriously?" or "really?" or "wow, just wow." Sometimes they came in combination. However they were used and overused, they made masses of people sound like passive aggressive sarcastic robots from the same factory.

:wojak-nooo: "Wow, really? Seriously? Wow, just... wow. Epic fail."