To coin a phrase
Definition 1 of 2
Pro Tip 1/3Fresh Twist
Use it when giving a familiar idea some new flair or perspective. 
He's reinventing the wheel, to coin a phrase, with his innovative designs.
Pro Tip 2/3Unexpected Context
Apply it to make a known saying sound surprising or creative. 
She's got a green thumb, to coin a phrase, in technology.
Pro Tip 3/3Witty Rephrasing
Shows a clever or humorous change to a common expression. 
He's not avoiding work, he's on a permanent coffee break, to coin a phrase.