double south meld
In mahjong, a pung or kong of south tiles when south is both the round wind and the player's seat wind. This meld is worth extra points. Compare with 連風牌 (renfonpai), which is the general term for a double wind tile.
from Chinese
See also: 連風牌
I called pung on the double south and secured the yaku.
Since I'm the south seat in this round, I can aim for a double south meld.
From English 'double' (ダブ) and 南 (nan, 'south').