Matthew Poole and continuators on Psalms 78:30

30 They were not estranged from their lust : but while their meat was yet in their mouths,

The sence is either, 1. Whilst their greedy appetite yet continued, and was not fully satisfied; before they began to loath it, as they did afterwards, Numb. 11. 20. Or 2. Before they were deprived or destitute of their desired food, whilst they enjoyed it, and were still feeding upon it, as the next clause explains this. God's patience did not wait upon them till that food was spent, but fell upon them instantly.

Marginal references: Num. 11. 33.