Monopoly is a direct reference to the popular board game. While it's an English word, it's used here in a French song, making it instantly recognizable and intriguing for English speakers.
In the song, Fally Ipupa sings, "Tu joues avec mon coeur comme un Monopoly" (You play with my heart like a Monopoly). This metaphor vividly conveys the idea of someone toying with emotions, controlling the situation, and perhaps even exploiting it, just like a player dominates the board in Monopoly. It's a clever and relatable way to express being emotionally manipulated.
"Nairobi" is Fally Ipupa's nickname for the woman he's singing to. He says she plays with his heart the way you'd play Monopoly, moving her pieces around like his feelings don't matter, and that her hold over him is strong enough to shake the whole country.
Even so, he stays devoted. He tells her nothing lasts forever here on earth, promises to follow her wherever she goes, and asks her to dance for him because she's not like anyone else he's known. He's seen the cracks in her heart too, but he still says he found her worth the wait and doesn't want to play games back.
The mix of French and Lingala is typical of Congolese rumba, and the shout-outs near the end ("El Mara, King Aigle") are a nod to the people around Fally Ipupa rather than part of the love story itself.