Isekai is a popular genre of manga and anime involving a character being reborn in another world, or more recently as some weird item or monster. Often this is initiated by the character dying. (See “truck-kun”).

In this scenario, after incorrectly pronouncing ASCII, the American character encoding standard, as isekai, the speaker is hit by an IBM truck (a company famous for its early advances in computing, among other things), and is reborn around the time they had market dominance in personal computers.

I don’t think IBM had much of anything to do with the creation or popularization of the ASCII standard, but memes can’t all be perfectly accurate.

Hope this helps!

Isekai anime - in general means the protagonist is transported into a different fantasy world from the real one, sometimes it's thru "magic" or "tech" (mmo VR style) but mostly it's as a kind of reincarnation.

One of these animes had the protagonist hit by a truck while saving someone and with the rising popularity of these shows, a trope emerged "got hit by X and got isekai'd into Y".

ASCII (wiki) is the older way of doing character encoding for computers.

Isekai (also wiki) is a sub genre of anime that involves getting teleported from a normal world to a fantasy/sci-fi setting. Getting hit by a vehicle in an Isekai anime has become a meme as the means of being teleported.

The 1985 in Seattle... Idk what's referencing specifically.

Edit: I should have included IBM in my googling haha Looks like IBM in Seattle in 1985 (IBM website) was really hitting its stride