The correct spelling of the phrase "sat on butt" might seem obvious, but there are actually a few nuances to consider. The first word, "sat," is a simple past tense verb and is spelled phonetically as /sæt/ (s-a-t). The second word, "on," is a preposition and is pronounced as /ɑn/ (o-n) in the context of this phrase. Finally, "butt" is spelled phonetically as /bʌt/ (b-u-t) and refers to the fleshy part of the body that one sits on.