Joining the thread a bit late since I have just discovered it.
There are, as you might well guess - several spellings of SEGOTIA - including SAGOSHA and SHEGOSHIA. As everyone has said its meaning is "close friend" in male usage. Used in "The Hair of the Dogma" by Myles na gCopaleen. A dictionary of Irish Slang "SLANGUAGE" by Bernard Share, 2nd edition published in 2003 by Giles and McMillan - which has its own web site.
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sj