Slang for smoking gods greatest gift to this planet...the ganja. Must say with an accent to get across the point that you are high in the sky with the flies.
-"Yo man what are you doin?"
-"Oh you know we just got done humming a biscuit, the moon is quite nice up here."
-"Word."
by TupacsProstituteTeeHee September 29, 2010
Get the Humming a biscuit mug.