He's been busy lately - busy with what, well, you know.
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Popular online since the 2010s for hinting at something you don't want to spell out - gossip, politics, censorship, or adult content. Former foreign minister Li Zhaoxing's 'you know the answer' at a 2013 press conference gave it a second life.
usage
The 的 is pronounced in a neutral tone. Written also as 你懂得 in some contexts.