godan verb (-ru)
act smug; act self-satisfied
Slang, derogatory. Often used for someone acting smugly nationalistic or self-righteous, derived from ホルホル (the sound of snorting or chuckling smugly).
See also: ホルホル
ネットで自国自慢ばかりしてホルる人が嫌いだ。
I dislike people who act smug online, constantly boasting about their own country.
彼は会議で自分の意見が通るたびにホルっている。
He acts smug every time his opinion gets through in the meeting.