Rural Australian slang for
1. laying on one's stomach
2. asleep from being plastered, wasted, etc.
3. Worn out from hard yakka or work
1. The scrumleft him flat out like a lizard drinkin.
2. Too much VB and Becky's flat out like a lizard drinkin.
3. *yawn* I'm flat out like a lizard drinkin