Wiktionary
donkey ears
n. A hand gesture made by placing the thumbs above each ear and waving the index fingers in unison; used to express derision.
Usage examples of "donkey ears".
He had a horn for a nose, a lion's mane, pig eyes, donkey ears and billy goat whiskers.
He thought of Arthur in his last race, donkey ears flapping, big feet splaying out in all directions, but with so much heart in his great grey girth that he ran on and on, just tipping the last fence in his tiredness.
If the joker with the donkey ears recognized her, he gave no sign.
When he kissed her in the hollow behind her expressive donkey ears, she smelled human.
I've been livin' in the land of do-as-you-please for so long, I'm surprised nobody else has noticed the fuckin' donkey ears growin' oot the top O my head.