When someone releases feces into one others mouth, then that person packs the feces in their own mouth for a air tight non opened mouth, used for making yourself sober.
1) A horrible, scurrilous, fecally fecund urban pest.
2) Any loud, obnoxious bird, especially belonging to a species that can be found roosting in large, raucous groups. Seagulls are an excellent example of the dreaded packbawky.
an elegant avian inhabiting urban areas. Packbawkies are valued for their rich melodious cries which mask the industrial clamour of city streets. They are intelligent and artistic, working collaboratively to decorate buildings using a transient medium composed of urates, oxalates, and phosphates.