[martyvis]

I presume by only referring to it with one syllable, it also helps reducing movement of mouth parts just as the "keeb" does for hand parts.

[YinglingLight]

I presumed is was another example of the infantilizing of young adults today. 'Look at my cute pupper!' 'Just got dishy installed today Elon!'

[kortex]

It's not "infantilizing," it's linguistic mutation, and it's what languages do [0], for all manner of reasons. Text lacks intonation, plain text even more so, and internet dialect tends to evolve ways to add emphasis. In this case "pupper" is inflected to suggest endearment.

https://en.m.wikipedia.org/wiki/Grimm%27s_law