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what does it mean?
Is this a common expression?
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AnonymousIs this a common expression?
No, but it is creative—I may use it.
Anonymouswhat does it mean?
"Add the prefix 'extra-' to the word 'ordinary' to produce the word 'extraordinary' ." Since 'ordinary' means 'common' and 'extraordinary' means 'uncommon, exceptional, outstanding', the phrase you quote means to make something exceptional out of a rather average thing/idea/product.
Comments  

Extra means more added to the usual; Excessive; Extravagant.

Ordinary means no special or distinctive features; Normal; Standard.

PUT THE EXTRA;

PUT Meaning Put into; Implement; EXTRA Meaning the Excessive, Extravagant, More than usual.

INTO ORDINARY;

INTO Meaning add; Ordinary Meaning Normal or Standard.

Example:

That quarterback Tom puts the extra into ordinary