A linguistic article on this topic:
OMG the Word-final Alveopalatals are Cray-cray Prev(alent): The Morphophonology of Totes Constructions in English: https://repository.upenn.edu/pwpl/vol22/iss1/30/
Maybe they're going for a certain feel. I definitely get annoyed when I hear these abbreviations/cutesy shortenings of words. It reminds me of a young mom that can't disengage from her children, or a newly moneyed businesswoman or such. Always a woman. I have heard men doing it though. People usually do it to be cool, like they're inventing their own dialect on the fly while talking to you that's separate from all around you.
I wouldn't be surprised if there's linguistic research on the subject.