tube egg

A possibly mythical pre-cooked and packaged cylindrical boiled egg. Allegedly available in supermarkets in Asia specifically Japan although never actually spotted in the wild during multiple trips.

Highly sought-after and coveted by my workmate Kevin. The man will never give up hope of finding some.

Can also be used as slang for wanking (see example).

"I'll just have to make my own tube eggs" - Kevin at work