Sleemo was a Huttese insult.
In 32 BBY, as Tatooine native human Anakin Skywalker, in preparation for the Boonta Eve Classic, adjusted his podracer, Dug rival Sebulba taunted the young boy. Skywalker remained steadfast and insulted the Dug using "sleemo."
Sometime before 22 BBY, on the moon Nar Shaddaa, human bounty hunter Jango Fett inquired with a Lannik if they knew the thief that stole the Hope of Glee Anselm. After Fett subdued a that the Lannik had beset upon him, the Lannik confessed to being ignorant of the thief's identity. As the bounty hunter attempted to leave, the Lannik threatened him. Fett responded by calling the Lannik a "sleemo" for starving the k'lor'slug and removed the shock collar from her.
In 22 BBY, Fett hired Clawdite bounty hunter Zam Wesell to assassinate Padmé Amidala. After failing to kill Amidala in her apartments on the planet Coruscant, Wesell was chased through Galactic City by human Jedi Master Obi-Wan Kenobi and Jedi Knight Anakin Skywalker. After the Jedi captured Wesell, Fett killed her with a poisoned saberdart. In her dying breath, she cursed Fett using "sleemo."
In 21 BBY, Kenobi and Skywalker captured the Faust Doctor Nuvo Vindi, preventing him from releasing the Blue Shadow Virus. As the Jedi prepared to take Vindi to Theed, Skywalker referred to the doctor as a "sleemo."
Later that year, Togruta Padawan Ahsoka Tano called the Duros bounty hunter Cad Bane a "sleemo" after he had flaunted his victory over the captured Padawan.
"Sleemo" first appeared in the prequel trilogy film Star Wars: Episode I The Phantom Menace, which was released on May 19, 1999.
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