马后炮 (măhòupào) Belated effort
The character “马 (mă) refers to horse; “后 (hòu)” means later or after and
“炮 (pào)” means big gun or cannon.
Example:
Nǐ zhè rén jiù shì mǎhòupào, shìxiān zěnme bù tíxǐng wǒ a.
你这人就是马后炮，事先怎么不提醒我啊。
You always give belated effort. Why not remind me in advance?
Got questions?