What is a "Ninja" Ebike?

[capefox]

I hear people talking about a "ninja" ebike but what do they mean? Is it a brand name or does it have some special meaning?

 

[PDXzap]

Some people refer to a bike where it's not obvious that the bike is electric assist as a ninja ebike.

 

[capefox]

Some people refer to a bike where it's not obvious that the bike is electric assist as a ninja ebike.

I'm beginning to get the picture - thanks!

 

[capefox]

Kawasaki Ninja?

It's becoming clearer...