The title of a situation between two people who are "hooking up exclusively" but have not acknowledged to each other or to the public at large that they are dating.
In reference to one's relationship status: Q. "What are you guys?" A. "We're bearsharking" or "we're not dating, we're just bearsharking."
The organic lovechild of a 3-way between a Bear, a Shark and an Octopus. Has all the awesome traits of each animal in one crossbreeding superior being.
"My coworker quit smoking and she's acting like a Bearsharktopus today!"