Do not be that girl.
You're hanging out at the bar, having a good time, and you end up needing to pee. So you head to the bathroom, and pushing by you on their way into the bathroom are two girls. Rather pretty, very polished.
One of them says to the other, "An' then-uh, he was like, iunno all like call you or su'thee... An' I was like yah-uh, ih was gradle-like, meechoo. Or wha'ever." (translation: "And then he was like, 'Give me your number for when I'm lonely.' And I was like, 'Sure, I feel like the emptiness in my head must be replaced by a filling of the vagina.'")
Good heavens, woman. Where did your tongue go? DID YOU HAVE A HORRIFYING CHILDHOOD ACCIDENT? No. The answer is no, she did not have a horrifying, childhood, tongue-removing accident. She just doesn't use it in speech. A couple of hypotheses as to why not: she's incredibly lazy. It is just WAY too hard for her to use her tongue to talk. Her tongue is just heavier than everybody else's tongue. Using it for speech would tire the muscle so much she would not be able to perform the important function of eating. In fact, it would tire the rest of her body. She would lie comatose on her bed at her parents' place, drooling onto a quilt, while her mother makes soothing noises and tucks Mr. BunBun into bed with her. How dare you try to make her use her tongue like a mere mortal. For shame.
Second hypothesis: her tongue is just used to being depressed to the bottom of her mouth, so she doesn't use it. This is tangential to the other problem this girl typically has; her mouth is always open. Not in a fly-catching way, but in a - what is to her - seemingly seductive pose of mild surprise and invitation. It is as though with every passing second, she is expecting a penis to fall out of the sky into her mouth. Her annoying tongue-less speech pattern is actually just broadcasting, "Hey, in case you thought anything would get in the way... NOPE! So please, go wild." That's right, your sphincter just got a little more relaxed because that's so sexy. Or maybe it didn't.
Either way. Don't be her. And eat a freaking sandwich, dude.