A bullhonkey cover is a RidewithGPS privacy zone cover used by CDOT road bicycles to mask activity recorded on Mountain biking trails.
Sophie: Oh sh!t why am I on the C-470 trail instead of C-470? Stupid group ride! I guess I will use a bullhonkey cover to mask that embarassment up and stick to the shoulder from this fucking moment till the moment I die.
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.