Isn't this like that wobbly tiger head thing, but this is Blue Bunny, so it's breasts?

Ah, found it. Never mind. It didn't occur to me that it would be a bobblehead/bobbleboob.
Likely to be based off this:
http://www.js-gartendeko.com/p/560912515/wackel-tier-figur-tiger-gross-mit-wackelkopf

This artist always tries to do odd ways of placing things in his drawings.

...You know, I'd be surprised if there isn't already some kind of real product like this, given all the gag gift stores out there.

YuriTenshi said:
...You know, I'd be surprised if there isn't already some kind of real product like this, given all the gag gift stores out there.

Kind of the same concept: http://www.entertainmentearth.com/item_archive/items/Tenjho_Tenge_Capsule_Toy_Bobble_Breasts_6Pack.asp

It's just based on akabeko. They're basically papier mache bobble-head cows. The title of this picture is Papier Mache Tiger.

I've lost count of the number of times I said, "Godsdamnit, Ao..." That said, this guy never ceases to be ridiculous. I love it.