1. An exclamation used to express surprise, emphasis, or mild oath; a euphemistic alteration of 'by Jesus.'
Usage: informal; chiefly Irish English; dated or humorous

Examples

• Bejasus, that was a close call!
• Well, bejasus, I never expected to see you here.
• Bejasus, the weather has turned cold.
• By bejasus, that's the funniest thing I've heard all week.