1 : being or going at maximum effort or speed. 2 : out-and-out, downright it was a flat-out lie. flat out. adverb.

What does we are flat out mean?

(Australia) Lazy, sleeping.

Does flat out mean tired?

2 lying down, especially because you are ill or extremely tired: He was flat out on the bed. 3 (especially American English) in a definite and direct way; completely: I told him flat out 'No'.