# What does “you are feeble and you know it ” mean in the context?

This part is in a Children's math book, it teaches how to use cancellation in dividing. the sum is 270/18. 270 and 18 are both broken down to their prime factors, so it become 2x3x3x3x5/2x3x3, and the female character in the book suddenly sing "You are feeble and you know it"in the illustration nearby. What does the it mean in this context, why would she say that?

//Transcript:

270/18 = 2x3x3x3x5/2x3x3 Now we can cancel. This means if any number on the top has a matching number on the bottom, We can cross them both out!

[Illustration] "You are feeble and you know it" (the female character sings this out, holding a scarf with both hands above her head)

We are just left with 3*5 on the top, that gives the answer 15, so 270/18 = 15

• Are you sure it is "feeble"? Seems like an odd word for a kid's math book. – Lambie Sep 20 '20 at 15:59
• British football ("soccer") fans, if their team has won a match, often call out "You're sh*t and you know it" to the fans of the opposing team. Maybe the girl is proclaiming victory over the arithmetic problem, and is being more polite than football fans? – Michael Harvey Sep 20 '20 at 16:02
• Google reports no instances at all of the two sequences You are and You're ... feeble and you know it either in Google Books or the Internet at large. It's clearly modeled on the Baptist church / Football terrace chant If you're happy and you know it clap your hands (which itself leads to variants like you're shit and you know it for the latter), but I can't imagine what it's supposed to mean in the cited context. – FumbleFingers Sep 20 '20 at 16:07
• I think the arithmetic problem is being proclaimed "feeble" because it has been defeated. – Michael Harvey Sep 20 '20 at 16:09
• English uses You are [x] and you know it. incredibly frequently. However, feeble is rather odd here, as I said. We might say: You are very smart [well-dressed] and you know it. Or anything at all, really. He is so stupid and he knows it. This usage is a cliche. – Lambie Sep 20 '20 at 16:11