What? There are other meanings to these?

Hmmm, Google did bring up some other meanings.

.... I wondered why all of the young stars on tv kept having their best friends fall down. This also explains why I kept being told TTYL when I was texting and when I responded in all CAPS they would reply back several hours later.

I also just figured out why some of the girls that I text to would get mad at me for nothing. I thought "FAT" was "fell asleep texting".