Hackett Combo - Putting two fingers in one place and the third in another. I

Putting two fingers in one place and the third in another. It’s named after a guy who was too dumb to know it already had a name.

I did the Hackett Combo and my sister laughed so hard she fell off the couch.

He did the Hackett Combo and got in trouble with the principal.

My friend tried the Hackett Combo and got a wedgie.