Refers Thirteen 十三点 Shísān Diǎn Mild Affectionate Insult

十三点

shísān diǎn

A mild, usually affectionate insult meaning “weirdo” or “crazy.” Literally “thirteen o’clock.” Originated in Shanghai and used a bit in other parts of southern China as well, though it is fast falling out of favor and is mainly used by older people now. The term refers to the chī in báichī (above), as the character for chī, 痴, is written using thirteen strokes. Other theories maintain that it refers to an illegal move in a gambling game called pai gow, 牌九 páijiǔ (pie joe) in Mandarin, or that it refers to an hour that clocks do not strike (though nowadays thirteen o’ clock is possible in military time).