do a brilliant Bush?

[Joe]

This is an excerpt from Langman Dictionary:

He does a brilliant George Bush (=copies him in a very funny way).

I understand that "does" here means "copy one's behavior". What makes me confused is the explanation after the sentence. When someone says "he does a brilliant Bush", how should we know that he does it in a funny way? I mean, which word in the sentence tells us that it is "funny"? Thanks. :)

[Casiopea]

This is an excerpt from Langman Dictionary:

He does a brilliant George Bush (=copies him in a very funny way).

I understand that "does" here means "copy one's behavior". What makes me confused is the explanation after the sentence. When someone says "he does a brilliant Bush", how should we know that he does it in a funny way? I mean, which word in the sentence tells us that it is "funny"? Thanks. :)

The word impression has been omitted:

He does a brilliant impression of George Bush. :D

impression (n.) imitation of a person or sound, especially as entertainment.

All the best, :D

[Francois]

When someone says "he does a brilliant Bush", how should we know that he does it in a funny way?

When you act out like someone, it's generally meant to be fun. I can't think of a context where you would expect to be taken seriously doing so (drama class, maybe...)

FRC