Yo... Kobe, you're going down man. Did you forget the low grade fuel?
Low Grade Fuel
Explanation
Explain Bear
Alright, listen up, buttercup. This joke is about Kobe, probably Kobe Bryant, the basketball dude. The joke implies that Kobe is "going down" because he forgot to use the right kind of fuel. It's a diss, see? Like calling someone dumb. Now go back to drooling.