The UFC superstar -- who already got himself a $500k Rolls Royce earlier this year -- hit the streets of L.A. last night in a Lamborghini Aventador LP 700-4 Roadster ... another car that costs around $500k.
This one is special ... it spits fire from the back exhaust. McGregor calls it a flamethrower.
So, why is Conor showing off? According to McGregor ... he wants to motivate you.
"I'm not trying to rub it in posting these. We don't even have these at home," he wrote.
"Nice things in life are motivating.