expression, godan verb (-u)
boss around; push around; order about arrogantly
Idiomatic expression: literally 'use someone with one's chin', implying giving orders in a haughty, dismissive manner without proper respect.
See also: 頤で人を使う
彼は部下をあごで使うような上司だ。
He's the kind of boss who orders his subordinates around arrogantly.
あの人はいつも人をあごで使ってばかりいる。
That person is always bossing people around.
expression, godan verb (-u)
Slang usage, likely derived from the image of moving one's chin while talking incessantly. Less common than the idiomatic sense.
あいつらはいつもあごで使ってるだけで、何も仕事をしない。
Those guys are always just jabbering and never do any work.