I think its someone souped up egg flinger used in egg flinging contests...not that i have ever heard of an egg flinging contest but thats my guess.
...or maybe something use in a jello shot game.
Unfortunately not at the moment but hopefully I will be able to post one, one day!
.i have never come across eggs being served like this in the states but on every british tv show they show eggs eaten in this manner.
Potato masher?