itch to (do something)
To have an interest in or desire to do something. I'm itching for another road trip—when should we go? If you're itching to act again, then you should get back on stage.
*itch to do something
Fig. a desire to do something. (*Typically: get ~; have ~; give someone ~.) I have an itch to see a movie tonight. Tom has an itch to go swimming.