What does a cake beneath the user name mean?

[jo.vo]

See the threads title.
I just noticed that there’s a cake beneath my user name:

Where does this come from / what does it mean (if anything, that is)?

[TPX (Thomas D.)]

Hover your mouse over it.

[jo.vo]

Ah. I’m on the iPhone atm so that doesn’t work.
Will check at the desktop though, when I’m at it.

[TPX (Thomas D.)]

mom

[TPX (Thomas D.)]

[jo.vo]

So, when is my cake coming to my house