The phrase is Polish slang: 'piękna bramka' means a beautiful goal, and 'morda' is a rough, friendly way of addressing a mate, drawn out here as 'mooorda' for emphasis. With no clear single source, the clip has spread as a shareable reaction on Polish soundboards and in football edits. Its appeal is the timing and delivery rather than the words alone, so creators reuse it for virtual goals, five-a-side highlights and any small win that deserves an exaggerated, matey celebration.