What does the slang "My eye!" mean?

Does the slang my eye in following sentence represent "Surprise" or sadness?

I heard that you made a high jump of eight feet at the track meet. My eye!

From the paragraph above, I understand that the speaker was surprised/shocked or unhappy to know his friend made that high jump.

Please correct me.

Solution 1:

My eye

Like hell, that's nonsense, as in You were at the library all day? My eye, you were!

This slangy expression of disbelief was first recorded in 1842. From about 1800 to the 1930s the same term was used to indicate surprise ( My eye, she's been promoted after all.) but this usage seems to be obsolete.

The Free Dictionary

Therefore, in your sentence, the speaker is bemused by the claim.

More like the colloquial - My a** you made a jump that high!