Bussi, who was speaking to Galaxy T.V., said he was shocked when Omutujju, whom he knew as a footballer, released a hit song.
Feffe Bussi claims Gravity Omutujju stole his music.
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Gravity Omutujju started making major headways after remaking Paul Kafeero's Walumbe Zaya in 2011.
"I was in S.5., and Omutujju dropped a hit... I knew him as a fala [a derogatory term for someone who is unsophisticated and clueless]," said Bussi.
Feffe Bussi and Omutujju knew each other from a young age, as they went to the same primary school.
It's in high school that they went to different schools though Bussi had a brother who was studying with Omutujju at Old Kampala Secondary School.
Omutujju, real name Gereson Wabuyi, dropped out of school after Senior Four because of school fees, said Bussi.
Bussi said his brother would tell him that Gravity was stealing his rap bars.
Bussi also said that the name Gravity was initially his. It's Omutujju who gave it to him, then reclaimed it when he started singing.
Though they've had a bit of beef, Gravity Omutujju and Bussi have a song together titled Neetya.
Who is Feffe Bussi?
Bussi, who recently acquired new management after parting with his former manager Arafat, released his first single titled Summertime in 2013.
The rapper, whose real name is Frank Mukiiza, didn't break through until 2015 when he teamed up with Sheebah Karungi who was already a household name to release Nsekula.
In 2016, he followed up with another banger titled Yes No and cemented his name in the Hip Hop world when he dropped Who is Who in 2018.
According to publicly available information, Feffe Bussi was born on December 9, 1993, and he grew up in Nakulabye, Nabulagala.