Green’s Dictionary of Slang

(Irish) usu. cons. with old, a close friend.

1965		Threshold (Dublin) 18-21 46: ‘Would you look at who's here? The wanted man himself. How are you, Kreuger, me old segotia?’.
1970		M. Campbell Nothing Doing 44: ‘And how do you propose to do that, me old segotia’.
1988		H. Leonard Leonard’s Log — Again 64: A joy that lingers from last night was meeting my old segotia, the designer (but not of Pygmalion), Pat Murray, for the first time in years.
1996		P. Howard The Joy (2015) [ebook] It just happens that you’ve arrived at the right moment, me auld segosha.
2001		J. O'Neill At Swim Two Boys [ebook] The bugler boy was pal of his heart. My old segotia.
2011		A. McCabe Under the Avalanche [ebook] [T]he front door opened and out charged a barking dog. ‘Spot, Spotty,’ she called excitedly, ‘come here to me my old segotia’.