The rapper - who has the real name Stayve Jerome Thomas - also said he had stayed in his truck but still managed to contract the deadly virus.
He said: “So check this out, no games being played.
“The other day I got tested for the coronavirus yesterday and it came back positive. As careful as I been self-quarantine and staying home… I might went and got something to eat or did some simple stuff like that.
“Nothing crazy, stayed in my truck, had masks, gloves, everything on and my test came back positive."
Slim Thug insisted his fans had to take the killer bug "seriously" by sitting at home in self-quarantine.
The rapper urged his following to avoid going outside for as long as possible.
Listing off his symptoms, the musician said he had a "sliver fever and a cough" when he contracted the virus.
Now the star said he was "feeling better" and on the mend amid the coronavirus pandemic sweeping the globe.
He added: “So y’all gotta take this stuff seriously. Sit at home, self-quarantine, do not come outside for however long they are saying. If you have symptoms, you need to get checked out or whatever.
“I’m good. I feel good. I don’t got no problems right now. The other day I had a slight fever and a cough. I feel better now. I have no fever, you know what I’m saying?
“I feel like I’m good but you all better take it serious. It’s real out here. Coronavirus."
Many celebs have gone into self-isolation at their fancy houses amid the COVID-19 outbreak.
Tom Hanks and his wife Rita Wilson, both 63, were the first celebs to test positive for the virus.