捂捂蓋蓋 [－－盖盖]

Jyutping wu2 wu2 goi3 goi3
Pinyin wǔ wǔ gài gài

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be secretive; to attempt to cover something up or hide away
    (syn.) 掩掩揜揜, 藏藏掖掖, 遮遮掩掩