Janey Mac is widely used in Ireland as a euphemism for Jesus Christ, to avoid taking his name in vain. See also: Jakers and James's Street.
Janey Mac, what the hell were you thinking?
by Matt Madra April 26, 2008
1 more definition
Wow! An exclamation usually used with 'Good Golly, Miss Mollie...'
Good Golly, Miss Mollie and Janey Mac!
by PMacSwiney December 02, 2006