The 22-year-old rapper, also known as Mr. Guti, says his generation is fed up with the false piety of politicians and religious authorities who preach about faith and duty but have let Basra fall apart.
"We need to be critical of everything that's not right," Chayeb told The Associated Press in a recent interview in his home studio, where he recorded " This is Basra ," lashing out at the powerful Shiite religious establishment.
Basra, long known around the Persian Gulf for its drinking establishments and its maritime vibe, fell under conservative rule after Shiite clerics and militias took over the city in the vacuum caused by the 2003 U.S.-led invasion of Iraq.
Once renowned for its canals and markets, Basra's waterways today are clogged with waste, and its drinking water is filthy. The city erupted in violent unrest last summer that led to demonstrators burning down government and party-affiliated buildings.
Amid the revolt, rap offered Basra's youth — tired of joblessness and failed services — an opportunity for lyrics blistering with criticism.
In "This is Basra," Chayeb raps against the backdrop of a march around the city's burning municipal building during last summer's protests, asking why his generation has been called on to fight a war for leaders who cannot secure water for the city.
The conflict he refers to is the four-year war against the Islamic State group that the U.S.-backed Iraqi government forces ultimately won. Many young Shiites followed a call in June 2014 by Iraq's top Shiite cleric, Grand Ayatollah Ali al-Sistani, for volunteers to fight against IS. Thousands died in that fight.
"We were martyred for this war, I fell, and the authority has forgotten my loyalty," he raps.
"You're not associated with Hussein," he goes on, invoking the revered Shiite imam and grandson of the Prophet Muhammad who died in the 7th century Battle of Karbala, and whose example Iraq's leaders have asked their youth to follow.
Chayeb, mindful of the dangers, is circumspect about where and when he performs. He says most of his concerts are arranged through private contacts; he stopped recording at a professional studio in 2016. He said he's received death threats that have grown more intimidating in recent months.
But he won't stop rapping.
"If we stay afraid, nothing will change," he said.
As a teenager, Chayeb watched U.S. and British rappers on YouTube, then got together with friends to perform his own rhymes. He also followed a string of Arab rappers and sees Klash, from the Saudi city of Jiddah, as one of his greatest influences.
"My aim is to explain what is happening to Basra because of the people who are corrupt," he said, adding that rap is a way "to release my pain."
Corrupt politicians and clerics should watch out, he says.
"Beware of Basra," he raps. "We won't be quiet until our demands are met."
Abdul-Zahra reported from Baghdad.