脚踏两只船不怕裤开档吗
[jiăo tà liăng zhĭ chuán bù pà kù kāi dàng ma]
Translating to 'Standing on Two Boats with One Foot Each, Aren't You Afraid of Your Pants Splitting?', it is a satirical or humorous expression describing people who try to have relationships or pursue two (or more) goals simultaneously at risk of embarrassment.