A Byronic stanza is an eight-line stanza written in ottava rima: the first six lines rhyme ababab, and the last two form a closing cc couplet. It is usually written in iambic pentameter and is especially associated with Lord Byron, who used it for witty, flexible narrative verse.
Example
He watched the city fade beneath the rain,
Then laughed at every solemn face he knew;
The morning lit the windows up again,
And dressed the broken street in gold and blue.
He packed his doubts and sent them down the lane,
As if regret were something one could do.
At last he turned, with one quick lifted glance,
And chose the road that offered one more chance.