Code for knee grow, with patella substituted for knee and expand substituted for grow. It is a subtle way of saying negro or to otherwise refer to an African American in a coded way.
Cori: "Who am I looking for?"

Craig: "He's right there."

Cori: "Who? Which person?"

Craig: "The . . . uh . . . patella expand."

Cori: "Oh, I see; he is right there . . . "
by PMax February 11, 2008

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