Use 'by jingo' to show you're extremely surprised or impressed by something unexpected.

Expressing Astonishment

'By jingo' sounds old-fashioned, so it’s often used to create a humorous or nostalgic effect.

Archaic Expression

This phrase is British and may not be understood elsewhere, especially by young people or in informal contexts.

'By jingo' can imply patriotism or political support, so be aware of the context to avoid misunderstandings.

Understanding its historical association with British imperialism may explain some reactions to its use.

Since 'by jingo' can express strong political sentiments, it may be offensive or too intense in casual conversation.