In my case, I may compare this with “wanna” wanna(want to) or gotta“gotta” (got to).
It's faster to speak...speak… But I just say this when I'm with friends, not with my boss...boss…
Writing t'as“t'as” is not correct in frenchFrench, it'sit's a bad part of what we call une forme élidée“une forme élidée”.
Post scriptum :
I post it as an answer but I hope some specialist could explain better than I do. And it was too long to post it as a comment.
I'm I'm not fluent in englishEnglish, I've got a technical english...English…
