zekzek

Etymology
Probably an alteration of, from. The change from to the harsher  perhaps onomatopoetic for muffled, aggressive speech.

Verb

 * 1) to gossip
 * 2) to hiss
 * 3) to twitter
 * 4) to utter a number of repeated -sounds to express disapproval
 * 1) to utter a number of repeated -sounds to express disapproval