wizzo
n.— «Lt. Col. Mark Buccigrossi’s the back-seat wizzo—vernacular for the acronym WSO, or weapons system officer/navigator—in the F-4 Phantom.» —“American F-4s future is mothballed” by Michael Shinabery Alamogordo News (N.M.) Dec. 16, 2004. (source: Double-Tongued Dictionary)