Meaning of hán:
汗
see 可汗[ke4 han2], 汗國|汗国[han2 guo2]; perspiration; sweat; CL:滴[di1],頭|头[tou2],身[shen1]
Ménggǔ dìguó yóu Chéngjísī hán chuàngjiàn.
蒙古帝国由成吉思汗创建。
The Mongol Empire was founded by Genghis Khan.
Pǎobù hòu wǒ quánshēn dōu shì hàn.
跑步后我全身都是汗。
After running, my whole body is covered in perspiration.
Pǎo wán bù, wǒ húnshēn shì hàn.
跑完步，我浑身是汗。
After running, I was covered in sweat.
Tā yīnwèi rè chūle hěnduō hàn.
他因为热出了很多汗。
He sweated a lot because it was hot.
to be speechless (out of helplessness, embarrassment etc) (Internet slang used as an interjection)
Tā túrán wàngjì le táicí, zhēn shì ràng rén pěngfù dàxiào, zhǐ néng wúnài de shuō: wǒ hàn!
他突然忘记了台词，真是让人捧腹大笑，只能无奈地说：我汗！
He suddenly forgot his lines and it was so hilarious, he could only helplessly say: I'm speechless!
