Male Students Have Trouble Concentrating

(I am teaching the solutions unit in a high-school chemistry class. When we get to the part about concentration of solutions, I ask the class:)

Me: “What does ‘concentration’ mean?”

Male Student: “To cut off.”

Me: *confused* “What do you mean?”

Male Student: “You know, to cut off. Like on a bull!”

(I had to try so hard not to facepalm in front of my students. Vocabulary is still important, people.)