As quickly as possible, lying down

Wikipedia Word definitions in Wikipedia
Flat Out may refer to: Flat Out (Buck Dharma album) , 1982 Flat Out (John Scofield album) , 1989

Wiktionary Word definitions in Wiktionary
1 (&lit flat out English) 2 complete, total, downright. 3 Very busy. 4 (context Australian English) lazy, sleeping. adv. 1 (context idiomatic English) At top speed. 2 (context idiomatic English) bluntly, no holds barred, totally, outright. alt. 1 (&lit ...

WordNet Word definitions in WordNet
adv. in a blunt direct manner; "he spoke bluntly"; "he stated his opinion flat-out"; "he was criticized roundly" [syn: bluffly , bluntly , brusquely , roundly ] at top speed; "he ran flat out to catch the bus"; "he was off down the road like blue murder" ...