Green’s Dictionary of Slang

up the pole adj.2

also up the chute

pregnant.

[UK]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.
[Ire](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.
[Ire]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.
[NZ] (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.’.
[SA]B. Simon ‘Outers’ Born in the RSA (1997) 584: I got out of the army as she was seven months up the fucking pole.
[Ire]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.
[Ire](con. 1970) G. Moxley Danti-Dan in McGuinness Dazzling Dark (1996) II i: I think I’m up the pole.
[Ire]G. Coughlan Everyday Eng. and Sl. [Internet] Up the pole: pregnant.