Definition from Wiktionary, the free dictionary
advantageous; cheap; ordinary; plain; convenient; handy; easy; then; so; thus; to relieve oneself
to know; to understand; (modal particle intensifying preceding clause); (completed action marker)
|simp. and trad.
- (literary) and that's all there is to it; and that's that
A sentence ending which is used to indicate that a decision has been reached.