粵典 (words.hk)香港詞
一個充滿商機或者賺錢機會嘅地方（量詞：笪） (a place or an area which offers many possibilities for making money)
名詞用例
渠務署成日要同判頭打交道，係笪油水地。
keoi4 mou6 cyu5 sing4 jat6 jiu3 tung4 pun3 tau4 daa2 gaau1 dou6, hai6 daat3 jau4 seoi2 dei6.
The drainage service department often deals with contractors; it's a real gold mine if you're looking for profit.