(slang) to go out to fool around (usually referring to a man who is playing around with other women behind his wife/girlfriend's back); (adjective) unreliable; slapdash; all show and no substance (to describe someone who just a snow job)
Definitions (粵典–words.hk)
形容詞、俚語
形容一個人尋歡作樂 living a dissolute life
佢又過咗澳門沙沙滾。
佢又过咗澳门沙沙滚。
keoi5 jau6 gwo3 zo2 ou3 mun2 saa4 saa4 gwan2. He has gone to Macau to live out a life of decadence again.
形容詞、俚語
形容一個人思想唔成熟，唔踏實，吊兒郎當 immature; not stable
唔返來食飯都唔交帶一聲，真係沙沙滾。
唔返来食饭都唔交带一声，真系沙沙滚。
You didn't bother to tell me that you won't be home for dinner. That's very immature.