Roast : nm and adj. Any roasted meat (poultry, leg, etc.).
To be roasted: compromise, grilled.
Wait for something to fall out roasted: all ready.
It will not fall roasted in his mouth.
It's not roast : we are not entitled to that.
Fall asleep on the roast: do not finish a job, take it at ease.
Sleeping on the roast: lying down with (on) a woman and falling asleep at the crucial moment.
Do not fall asleep on the roast: work diligently; watch someone or something carefully.
In the language of prostitution the expression "to fall asleep on the roast" is the fact that a customer lacks heart to the work during the performance of the prostitute and exceeds the allotted time.