The word "sat butt" has several synonyms that can be used to describe a similar situation. Some of them include "parked behind," "perched on," "rested on," "seated on," "occupied the seat of," "lodged on," and "settled on." These synonyms convey the idea of someone or something being in a seated position on a surface, often for an extended period. Each synonym may have slightly different connotations or emphasize different aspects of the situation, but they all serve as effective alternatives to "sat butt" and can be used to add variety and nuance to one's writing.