She picked it up from him.
But I've never Jr & Jr do it. But then maybe they just don't get on camera as much. But Jagoff Scalfatty is practically tongue fucking that food before taking a bite.
So out of curiosity, I wondered if Fatty has always eaten like that. The answer is no. If you go back to his oldest videos, he does not stick his tongue out. HOWEVER, "Crispy Cheddar Frico Burger" from 6 years ago Tammy tongue fucks it. You can't see if Fatty himself is doing it from the angle but I don't believe so due to the lack of delay for the tongue to escape his mouth and caress the food.
In Bison Tacos & Burgers(the raw bison burger episode) we do definitely get Fatty "eating it like a taco".
But in Bloody Mary Burgers(grilling) from 11 years ago Fatty absolutely does tongue the shit out of that meat before it goes in his mouth. That said, there are a number of videos where in the first 5 years or so, he actually does eat like a normal human on occasion. So maybe he was only doing it when "meat gud!" No, because 14 years ago in fat on the go Dino's Pizza Burbank, CA he basically uses his tongue like a prehensile tentacle to scoop the pizza into his mouth. But in JUN's SUSHI 13 years ago, he doesn't do it and we repeatedly see him eating without using the tongue. And in Tommy Pastrami - Huntington Beach, CA he's eating a giant pastrami sandwich, with no tongue. Chronic Tacos - Fullerton, CA again no tongue with a food I'd expect him to do it with.
There has to be something that is triggering the tongue.
Kogi BBQ Truck (part 2 Cypress, CA 12 years ago, no tongue.
Whole Hog Cafe - Bentonville, AR 11 years ago, tongues the ribs while eating them.
The Burger Bar vs Super Stack Burger - Burger Wars #10 (Las Vegas), 10 years ago he doesn't tongue the burger before he rams it into his face.
So yeah, after way more time spent looking at Fatty eating, I can't determine whether Tammy did it regularly before Fatty did because she's so rare in his early videos. However, Fatty seems to do it more often over time. Originally I thought it was just food that he thinks might fall... no. Maybe a combination of at least 2 of his favorite food groups(meat, cheese, grease, sugar), no. While this is inconclusive, if I had to make a guess, Fatty picked it up from Tammy based on his lack of doing so regularly early on while the earliest appearance I can find of Tammy eating on camera she looks like she belongs in a hentai with the damn food.
