The recent trend of saying the acronym instead of the sentence/phrase is stands for

acronyms neologisms

I know urban Dictionary is not generally considered an acceptable source, but it seems to be appropriate for this application... Texttalk

TextTalk
When a person talks like they text. They say the initials or abbreviated version of a word instead of the actual word or action.
Anne tells a joke.
Robert: (TextTalk)"That was LOL"

Holly and Jen are having a conversation over coffee. Jen gets up to get more coffee and says "BRB" (TextTalk)

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