Green’s Dictionary of Slang

1. (Irish) joined up with, as in having sexual relations.

1955

J.P. Donleavy Ginger Man (1958) 260: Rumor has it [...] that you’re socked in with a woman in Rathmines who works in the laundry in Blackrock and another in Cabra. [Ibid.] 263: You’re socked in there like a banana in the peel. Tony says that she can barely crawl to work in the mornings.

2. isolated, cut off.

1982

(con. 1970) J.M. Del Vecchio 13th Valley (1983) 271: Oh this fucken valley [...] It’s socked in tighter en shit in yer ass when hell’s rainin down.