A hebrew slang term meaning a long-winded orator. Sometimes also refers to one who significantly embelishes their stories with facts that are not necessarily based on reality.
"Did he tell you about his new job, too?"
"Ken, Eize Zayan Sekhel"
(Yes, what a brain fucker)
"Did you hear his story about how he ran the border and dodged all those bullets?"
"Kishkush, who mezayen basekhel"
(Nonsense, he's just fucking brains)
the act of leaving quickly without any notice or warning to anyone at a random time when things get stressful or annoying (just like zayn did with one direction)