Dis is means a state or act of relaxation. Like a fillet of fish, boneless, limp, and sometimes grilling in a pan, so is the one in a filleting act, usually positioned on a couch with many pillows propping one up in the optimal fillet, or most comfortable position. In this position of relaxation it is common to see people with head back or in awkward positions, mouth open, tongue out, snoring, signifying the relaxed state.
Im just filleting on the couch, ain't nothin goin on today.
Dang, that fool knows how to fillet.