I sort of do, although for me it's not so much words as imagery.
For example, when I'm walking around my neighborhood, I'm also walking a runway in my mind; I am strutting, I am gorgeous, I am a goddess! (Never mind that I would only come up to an actual model's collarbones and still weigh over 200 pounds--I am
fabulous.)
My affirming self-talk is...well, this sounds weird, but it's kind of rude. "Yeah, baby, lookit dat ____ getting all firmed up!" "Ooh, that waist is getting so thin it really makes your ____ look great!" (I fill in blanks with whichever body part seems relevant at the time.) Apparently my inner self is a construction worker wolf-whistling at my outer self.