What does 'the pants off of me' mean?

[Alvina]

English Grammar Tests, Elementary Level

ESL/EFL Test #132 "Conversations and Comprehension (3)", question 4

Woman: Do you want to see that movie tonight?
Man: Not really. The last romantic comedy we saw bored the pants off of me.
Narrator: What does the man mean? .........

(a) He didn't like the last movie they saw together because it was very boring.
(b) He wants to go to dinner instead because he's very hungry.
(c) He doesn't like to wear pants.

English Grammar Tests, Elementary Level

ESL/EFL Test #132 "Conversations and Comprehension (3)", answer 4

Woman: Do you want to see that movie tonight?
Man: Not really. The last romantic comedy we saw bored the pants off of me.
Narrator: What does the man mean? He didn't like the last movie they saw together because it was very boring.

Correct answer: (a) He didn't like the last movie they saw together because it was very boring.

Your answer was: incorrect
Woman: Do you want to see that movie tonight?
Man: Not really. The last romantic comedy we saw bored the pants off of me.
Narrator: What does the man mean? He wants to go to dinner instead because he's very hungry.
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Hi I'm Alvina, I'm a new comer and I really want to learn, understand and speak english.
I really wanted to thank you to be here and also for your help.
Here's my question:
I don't understand "...the pants off of me"
I would appreciate if you could explain it to me.
Thanks

[Mister Micawber]

'bore/scare/frighten the pants off someone' = make someone very bored/scared/frightened.
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Native English teacher at Mister Micawber's