Meaning:

    “死” means “diehard,” and “党” means “political party.” Originally meaning a diehard follower, the term is today often used by people to refer to their own close friends who they believe will never let them down in whatever situation.

    Example:

    A: 你最近有什么需要代购的吗？

    Nǐ zuìjìn yǒu shénme xūyào dàigòu de ma?

    Do you want to buy anything overseas?

    B: 好啊，我看中一款香奈儿的包包。是你要出国旅游吗？

    Hǎo a, wǒ kànzhòng yīkuǎn xiāngnàir de bāobāo。Shì nǐ yào chūguó lǔyóu ma?

    Sure, there is a Chanel handbag I want. Are you going on an overseas tour?

    A: 不是我，我有个死党下周去巴黎。

    Bùshì wǒ, wǒ yǒu gè sǐdǎng xiàzhōu qù bālí。

    Not me. A close friend of mine is heading for Paris next week.

    B: 太好了。回头我把要买的包包发图片给你。

    Tài hǎo le。Huítóu wǒ bǎ yào mǎi de bāobāo fā túpiàn gěi nǐ。

    Cool. I will send you the picture of the bag that I want.