R.B.F. (resting bitch face) Share definition Flag A condition where the face seems to be in a scowl even when not displaying any emotion She looks pissed. She's not she just has R.B.F. (resting bitch face) R.B.F. (resting bitch face) by elDoctor November 29, 2013 0 0 Get merch Get the R.B.F. (resting bitch face) mug. Buy Now — $32.95 See more merch