four kongs hand
A special mahjong winning hand consisting of four kongs (槓子) and a pair. Extremely rare and often considered a yakuman (limit hand).
from Chinese sì gàng zi
Four kongs is an especially rare hand even among yakuman.
He was tenpai for four kongs, but the hand ended in a draw.
From Chinese 四槓子 (sì gàng zi), literally 'four kong hand'.