Generally, freedom of expression gives you a constitutional right to mock anyone—and it even stretches to the right to offend others in some countries but surely, this is not the case in Zambia.
A Zambian musician-Pilato (real name Chama Fumba) recently released a song about a man named Lungu who carries a suitcase filled with whiskey and has no idea how to govern—and this has gotten him arrested, because the officials say it defames the president, Edgar Lungu, by accusing him of drinking too much and being incompetent.