A: Can you hold your liquor?

B: Yes, I can.

A: Well I can't, so I want you to take my keys. Can you?

A: Sure, I can do that.

Dear teachers,

What does " to hold one's liquor " mean? Somehow I just feel that the dialogue above is too simple to understand. I guess there must be some meaning behind it. Please advise.

You're spot on, Antonija. Good interpretation.
spot on = exactly right (chiefly British)
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I think it means ''Can you drink a lot and still be 'sober' enough to drive?'' Some people can drink one beer and they immediately get drunk, others can drink a lot more and they don't show the signs of drunkness (at least one cannot see them).But. let's wait and see what others will say.
 BarbaraPA's reply was promoted to an answer.
Ha! Before I heard your interpretation, I had wondered why speaker A would ask speaker B to hold his bottle of liquor. Now I got it. Thanks.

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Grammar GeekYou're spot on, Antonija. Good interpretation.
What is "You are spot on."? Need your help, please.

 CalifJim's reply was promoted to an answer.