What is multiplying? Your use of the word "fu" (ふ) for when you laugh. You used to say just "ha ha ha" like everyone else. Now the occurrences of you saying fufufu is really multiplying. You might also notice that this is similar to the word 増える, which means "to increase." This has a similar meaning and the same reading, use that to your advantage!
I thought your hair had multiplied somehow, but you had hair replacement surgery, huh? I see.