[dapangzi]

This is the correct.

I was first called this by a Chinese classmate from Beijing with a biting sense of humor, when I was at university in Tokyo.

We got on really well, to be clear. :)

Hanging out with him was actually how I got started with Mandarin, probably why I chose this username.

[rahimnathwani]

I remember when first learning Mandarin coming across a phrase '你发福了' which literally compliments someone on blessings (i.e. having become more wealthy) but idiomatically means you gained weight.

[dapangzi]

I really like this one. It's delightfully cheeky. :)