This little technique is called the brody fin strike.
6 seconds sound clip from the Bolo (1977) movie soundboard.
You can hear this line at 00:12:42 in the Blu-ray version of the movie.
Quote context
[...]
- Watch it, are you blind or somethin'?
- Why, not so fast, hey, you better pay up.
- Huh, you'll have to wait till I come back, all right?
- Huh, are you crazy? You can't just walk out without payin' a bill.
- Now hold it. I'm gonna teach you a lesson, you fat bastard.
- This little technique is called the brody fin strike.
- Ah, I'll show you a strutting cock.
- Don't even think of it, this chicken ain't no chicken. I'll show you how great I am.
- God dammit you bastards! You're really asking for it this time, and I'm gonna get you.
[...]