Alex Palczewski knows the saying’s a bit crude.

The message behind it, though, is critical to his process.

The third-year Broncos offensive lineman spent six years at the University of Illinois, and his first offensive line coach was Luke Butkus.

Yeah, familiar name.

“Nephew to the big guy,” the Chicago-area native says with proper Second City reverence for Hall of Famer Dick Butkus.

Luke Butkus would, like any coach, give out atta-boys when his pupils did something well. But he had a caveat. Always.

“He said, ‘If I pat you on the (butt) you should (expletive) in my hand,’” Palczewski recalled to The Post early in training camp.

Uh, what? PG-rated translation, please?

‘It’s kind of like, ‘don’t eat the cheese,’” the 26-year-old, nicknamed Palcho, said. “Where else can you be cleane

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