ummich means your mother in the arabic language, the correct way to say it is "ummik" but it is said in the gulf dialect which makes it "ummich" because those damn camel people keep putting "ch" instead of "k".. weld al ga7ba.. ehem, also, for a male it's ummak, only for a female it's ummich.
A word used to describe something completely awkward, weird, funny, or embarrassing. It could be something you saw, said, or experienced.
-You're buying something in a store and when you go to pay, you see the cashier and think: "OMG I just added her on Facebook last night and she's the cashier! That is so uhmish..."
-Checking out your reflection in someone's car and there happens to be someone in there. You walk away quickly saying: "That's uhmish..."