Oh, I agree. While it is possible to come up with a something decent, they generally sound juvenile and unintentionally comedic. But I figured I would give the OP to offer some examples before passing judgement.
I'm reminded of things like "grud" and "drokk" from Judge Dredd, which sort of developed their own coolness over the years but I think a large part of that was the mix of corniness and satire. But it's debatable whether it's really credible and IMHO risky, even in its target market; much more so for mass appeal, which like it or not, video games really do have to cater to at least to some degree. Such an obvious example might be a conspicuous turn-off for a lot of people; I mean I'm guessing, I'm no sociologist nor marketing type, but my own reaction might be a bit "hmm" if it comes at me with commonplace heat-of-the-moment expressions replaced by jargon.
