How to translate 脑袋短路 into English?

Question

I would ask this on ELL but I honestly have no idea how to express this in English. Online translation give "brain short circuit", which sounds more like terminology than self-mockery. I am looking for a translation that fits here:

A: 你刚刚要说什么? (= what were you gonna say?)

B: 没什么, 我脑袋短路了. (= nothing, I just ____.)

Another imaginary situation:

Some guy solves a math problem using a very complex method, and some other person shows him that it can be done very simply, and he says: "Oh! Right! I ___(脑袋短路了)."

Answer 1

How about:

brain fart

Google defines it as:

a temporary mental lapse or failure to reason correctly.
"I'm having a brain fart and can't spell his name correctly"

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英语学科网 has an article entitled “大脑短路”用英语怎么说？, which mentions:

There's a scientific term for this totally common phenomenon, which we like to call a "brain fart." "Brain fart" is used to refer to a temporary mental lapse or failure to reason correctly.
这种非常普遍的现象有个学名，我们称之为“大脑短路”。"大脑短路"是指暂时的大脑失灵，无法正确地进行推断。
Below is a list of brain farts that pretty much everyone has had one time or another.
下面就是我们每个人都很可能曾经做过的脑子短路事件清单：

Answer 2

脑袋-短路, based on what I understand, just means literally that the brain short-circuited or malfunctioned as an electrical circuit would. The expression that comes to mind in English is:

I blanked out for a second.

Or

My mind went blank.

Or perhaps

I spaced out for a second.

Answer 3

I found this with glitch:

也许，我脑袋里哪里短路了。 Maybe there was a glitch in my brain.

没什么, 我脑袋短路了。 Nothing, just a brain lapse.

Answer 4

I think "brain fart" is definitely the common way to say it.

But you could also use "zoned out", like

"Whoa, sorry, I zoned out for a second..." (哇，不好意思，脑袋短路...)

Answer 5

What about brain lag?

From Urban Dictionary it defines it as:

When it takes one's brain a few seconds to catch up with their actions.

But I think I had heard someone said this in your kind of scenario

Some guy solves a math problem using a very complex method, and some other person shows him that it can be done very simply, and he says: "Oh! Right! My brain lagged."