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It's not just "come get some." It's "You want some...*pause*...Come. Get. Some."
"Hell yeah" was also around before Stone Cold, but it's largely attributed to being his catchphrase.
I would hardly consider a change of shorts an "evolution." Anyway, Cena already explained that he wears jean shorts so that he can carry a cell phone with him even when he wrestles. Lame, but pragmatic.