I'm not a 100% sure, but I think it might be 'honking'.
wild geese makes a hissing sound
Geese make a honking sound
Geese
Geese
The sound made by geese is honk.
It is a "honk honk" and is called honking xoxo
Geese "honk."
The sound made by a wild goose
Geese make a honking sound
A group of geese is called a Gaggle. geese
Normally attributed to Geese
The sound a horn makes is called a toot or a blast.