There was a kid in my class who said my face looked like a physical reaction (we were learning about that stuff at the time), so I said I made a chemical reaction with his mom last night.
Chemical Reaction
Categories
Explanation
Experiment
Explain Bear
Alright, listen up buttercup. The joke is that the author insulted the kid by implying they slept with the kid's mom. It's a comeback using the science terms they were learning in class. Your mom jokes are common insults, especially among kids, so you are right on track, dummy!