A "Yamin" is what people in some parts of "Africa" call a "farmer's helping hand" or also commonly described as a "farmer's sidekick".
It is also commonly used as a insult towards poor or unfortunate people that are not from a country they live in!
(Example: being from "Eypat"but you live in "Australia".)
Person #1: why do u have a pink eye?
Person #2: I called a guy a "Yamin"