An Irish English exclamation of surprise or emphasis, a mild oath that's a euphemistic alteration of 'by God'.
Irish English dialect form, from 'by God' with phonetic transformation. The 'be-' derives from 'by,' and the consonant cluster shifted through Irish English sound patterns.
'Begorra' became so associated with stereotypical Irish English that it's now found mainly in caricatures and historical texts—it's a word that was real and commonly used in Irish English speech but has become almost a parody of itself in modern usage.
Complete word intelligence in one call. Free tier — 50 lookups/day.