great guns

adverb

1. Informal. in a relentlessly energetic or successful manner:

   The new president has the company going great guns.

interjection

1. (used as an expression of surprise, astonishment, etc.)

Word History and Origins

Origin of great guns¹

First recorded in 1870–75

Example Sentences

“Things are going great guns and we’re having so much fun,” MacLachlan says.

From Seattle Times

Every time the great guns fired, Isaac said he jumped off the ground.

From Literature

"It's all been going great guns and we've all been doing lots of publicity and interviews and writing articles for the papers and stuff, all at the behest of the Agatha Christie estate," McDermid told the Edinburgh International Book Festival.

From BBC

“Japan Inc.” was going great guns.

From New York Times

Again: we’re doing great guns here when it comes to buzzword bingo, but explanations of what Napster’s future business model might actually be are thin on the ground.

From The Verge