Green’s Dictionary of Slang

up the pole adj.²

pregnant.

1951		P. Larkin letter 5 Feb. in Thwaite Sel. Letters (1992) 169: I went down to Dublin to stay with a chap who had to marry a girl he put up the pole on VE night.
1961		(con. 1890–1910) ‘Flann O’Brien’ Hard Life (1962) 36: Putting duchesses and nuns up the pole and having all Italy littered with their bastards.
1970		C. Brown Down All the Days 193: Up the pole with you my good woman [...] they say the grace of God shines on us each time we make a child.
1981		(ref. to WWII) J. Henderson Exiles of Asbestos Cottage 38: Bertie sang [...] to the tune of the Egyptian national anthem ‘King Farouk, King Farouk / Put Farieda up the chute.’.
1985		B. Simon ‘Outers’ Born in the RSA (1997) 584: I got out of the army as she was seven months up the fucking pole.
1989		H. Leonard Out After Dark 98: I think that a girl like Angela’s ma was ’ud actually have to be a right innocent to be put up the pole.
1996		(con. 1970) G. Moxley Danti-Dan in McGuinness Dazzling Dark (1996) II i: I think I’m up the pole.
2001		G. Coughlan Everyday Eng. and Sl. 🌐 Up the pole: pregnant.