English
fatassed
From fat + assed.
Proto-West Germanic *fait
Proto-West Germanic *faitijan ‘to make fat’
Proto-West Germanic *faitid ‘fatted’
Old English fǣtt ‘fatted’
Middle English fat ‘fattened’
English fat
Today it means
adj fat, obese, having a fat rear
Language periods are conventional ranges, not dates for this word.
Etymograph / fatassed