Knock your socks off? What does that mean?

[Xavierka]

English Language Tests, Intermediate level

ESL/EFL Test #383 "English Slang Idioms (114)", question 7

"I can't wait to show you the new product we've designed, Max. It will knock your ......... off," Lilly told him.

(a) blocks
(b) socks
(c) chrome
(d) mirror

English Language Tests, Intermediate level

ESL/EFL Test #383 "English Slang Idioms (114)", answer 7

"I can't wait to show you the new product we've designed, Max. It will knock your socks off," Lilly told him.

Correct answer: (b) socks

Your answer was: incorrect
"I can't wait to show you the new product we've designed, Max. It will knock your blocks off," Lilly told him.
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The new product will leave you barefoot?

[Linda]

Hello,
This is an idiom - a common expression that should not be taken literally. It will knock your socks off means that it's really good/really surprising.
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