system
A chat on subreddit /r/me_irl
human
You couldn’t figure out an extremely common 3 letter abbreviation but “immediately” deciphered an obscure 17 letter abbreviation? 

Ok if you say so.

Edit to answer edit - wyd is “what’re you doing” aka what you doin, and the fact you googled it and still don’t understand.. lol
gpt
Wyd is definitely harder to work out without knowing it already since there's a word missing from the abbreviation