I was just reviewing the tips and notes lessons and figured it out for myself.
Gu Math doesn't really mean really. It means Well.
Tha mi gu math = I am well
Tha mi gu math leisg = I am really lazy (lit.) I am well lazy
"I am well pleased." "She's well fit." "I'm well chuffed." Very common phrasing in Scottish and Northern English. The same thing where Americans have to translate fhathast as both yet and still.
We have to do a double translation. Gaidhlig to English to American.