Nowadays, the saying is frequently used to assure an understanding between two people in conversation. Next time you find yourself in a situation where details aren't convenient to say out loud, a simple "你懂的 (nǐ dǒng de)" conveys "you understand what I'm talking ab0ut."
Examples:
1.
       Mike, nǐ zěnme hé Mary zài yì qǐ le?
Tom: Mike,你怎么和 Mary  在 一起了?
       Mike, how come you are now with Mary?
       Xiǎo diǎnr shēng, nǐ dǒng de…
Mike: 小 点儿     声,   你  懂   的… …
       Keep it down, you know what's been going on…
2.
       Zěnme le? Chóuméikǔliǎn de.
  Lily: 怎么了? 愁眉苦脸          的。
       What's wrong? Why such a long face?
       Wǒ wàngjì zhǔnbèi lǎobǎn yào de wénjiàn le, jiéguǒ… … nǐ dǒng de.
Lucy: 我忘记     准备     老板     要     的  文件    了,结果… … 你 懂   的。 
        I forgot to prepare the documents for my boss, so now…well, you know what'll happen.
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