I'm still trying to figure out how and when "explodes" became "asplodes," for instance. The first time I ran across it (playing WoW a few years back)., I assumed the person didn't know how to spell explodes, and my fingers twitched. But I've seen it often enough now to know there's got to be a reason for it, probably some pop culture reference I missed.
That's just one of those intentional misspellings, like when I write it 'bunneh' instead of bunny. I do believe 'asplode' is mimicking a hispanic accent, but I have no idea why or where it came from. I just saw it once and thought it was silleh, and I likes me some silleh
Kallithrix is right - they are definitely American English! The other one that really annoys me is when they write fit instead of fitted, i.e. it fit me.
Or 'drug' instead of dragged. That just grates on my braincells.