When You Leave a turd in the microwave for a long period of time so that when the person opens up the microwave, the turd explodes, like a landmine.
Jimmy: Do u smell that?
Tommy: Ya man. It smells like a Ukrainian Landmine!
Taking a crap in a person's slippers so that when they put them on in the morning, the landmine goes off.
I just stepped on a Ukrainian Landmine