"Flitter" Natural Recordings by Native Speakers
Flitter means to move quickly and lightly through the air, often in a fluttering or quivering motion, typically used to describe the flight of birds, insects, or leaves. It can also be used to describe something that is flickering or trembling with a sense of fragility or delicacy.
I apologize, but there is no word "flirtigig" in the English language. It's possible that it's a made-up or non-existent word.