I say

I say! That's impressive!

I say, what is the meaning of this?

Adrian thought it worth while to try out his new slang. ‘I say, you fellows, here's a rum go. Old Biffo was jolly odd this morning. He gave me a lot of pi-jaw about slacking and then invited me to tea. No rotting! He did really.’

I say! ... John ... Are you still there? If you're going into town could you get some eggs?

When such men as Mr. Burke, Mr. Dundas, Mr. Pitt, Mr. Windham, and my Lord Grenville: when such men as these unreservedly and repeatedly avowed their sentiments on the condition of the Slave; when they saw no danger in the avowal; […] when, I say, these men thus thought, spoke, and acted […]

But when Amelia came down with her kind smiling looks (Rebecca must introduce her to her friend, Miss Crawley was longing to see her, and was too ill to leave her carriage)—when, I say, Amelia came down, the Park Lane shoulder-knot aristocracy wondered more and more that such a thing could come out of Bloomsbury; […]

"Stop! Stop I say!" ordered the professor imperiously.

I say, I say, I say! Did you hear the one about the nun in a maternity ward?