I’m not a particularly big fan of abbreviations or nicknames for national holidays. I’m not sure whether it’s because I don’t think they give the proper deference to the occasion, or whether I just find it annoying in general. “Happy Turkey-Day!” for instance, sends shivers up my spine. Other notable offenses:
.: X-mas: Christmas
.: V-Day” Valentine’s Day
.: Columbus Day: North American Indigenous People’s Day.
I’m sure you get the idea.
So, in the full spirit of the holiday: Happy Thanksgiving!