Sesbij (Ses*bidge) n. a purple flying cow that carries a megaphone.
It is a lonely creature, because only one can live at a time. As soon as one lays it's egg the other one dies.
It is often found in the woods of Washington State and is known to randomly appear in large bouncy houses.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)