It indicates that someone tries to harm us. If we kill it, we will discover traps.
Dream dictionary: Bumblebee dream meanings
Dream with bumblebees or drones usually means predictable annoyances. Drone usually indicates that most likely the opponents of the dreamer will become particularly threatening and almost always with serious financial damage. In many cases this dream usually indicates treason.
To see a bumblebee, when you are dreaming, means coming troubles and difficulties in your life. If you were stung by bumblebee in your dream, then it is symbolic meaning of current distress and obstacles in your life. To kill bumblebee, means solution to your problems and success in relationship or partnership.