She makes a clucking sound and tilts her head up when she receives the answer.
Conservative columnists are chuckling and clucking and tweeting to beat the band.
Old English cloccian originally echoic. Cf. Turkish culuk, one of the words for "turkey;" Greek klozein, Latin glocire, German glucken. Related: Clucked; clucking.
1703, "sound made by a hen," from cluck (v.). Slang meaning "stupid person" (turkeys are famously foolish) is from 1927.