[Idiom] at that

[yuriya]

"You are thinking there might be something small about to happen, that's going to start a chain reaction . . . and we have a shot at stopping it?" I asked.
"Maybe."
"You are dreaming!" I shouted.
"I might be, at that. But I know we're here for a reason."

What is the meaning of at that here?
at that: 1) in addition 2)nevertheless 3)as it is
Nothing seems to fit. Any ideas?

 

[BobK]

'...now you mention it'. It's a way of referring to a possibility that you've only just considered.

(That's not a very satisfactory explanation - short words are the hardest! It's the best I can do though - I look forward to other glosses...)

b

 

[yuriya]

'...now you mention it'. It's a way of referring to a possibility that you've only just considered.

(That's not a very satisfactory explanation - short words are the hardest! It's the best I can do though - I look forward to other glosses...)

b

Maybe it's one of those things hard to get the meaning across to those who don't get it. Any other mind-breaking elaboration on this?

 

[chester_100]

Maybe it's one of those things hard to get the meaning across to those who don't get it. Any other mind-breaking elaboration on this?

It's very informal. Another expression is about that.
-Did you do your homework?
-Oh, yea, about that, well...