expression, na-adjective
just missed it; barely failed; not quite acceptable
Colloquial phrase used when something narrowly fails to meet a standard, deadline, or expectation. Often contrasted with ギリギリセーフ.
電車に乗ろうとしたけど、ドアが閉まってギリギリアウトだった。
I tried to catch the train, but the doors closed and I just missed it.
その冗談は笑えなくて、ギリギリアウトだと思う。
That joke wasn't funny; I think it's not quite acceptable.