Question?

What are montana tendergroins, swinging beef? Somebody please explain

Montana tendergroins

Bull fries is another nickname for bull testicles.

Swinging beef is another name for bull testicles.

Rocky Mountain oysters

Swinging beef!? Who'da thunk it? And why don't i already know about Rocky Mountain Oysters.
At any rate i could use some 'swinging beef' in my life right now