脚踏两只船的感觉就是扯蛋
[jiăo tà liăng zhĭ chuán de găn jué jiù shì chĕ dàn]
In literal terms, this idiom means 'having two relationships at the same time feels ridiculous.' A humorous or derogatory statement towards being involved in two or more conflicting situations or romantic affairs simultaneously, highlighting it's ultimately problematic and silly. It is considered cheating or not dealing with issues squarely in real life.