Green’s Dictionary of Slang

1. the penis.

1890–1904

Farmer & Henley Sl. and Its Analogues.

2. an unimportant, insignificant person.

1984

Partridge DSUE (8th edn) 693/2: from ca. 1840.

3. in pl., head lice, rats and mice, any kind of vermin.

1889		Clarkson & Richardson Police! 322: A seller of small-tooth combs ... Lodger removers.
1980		(con. 1930s) Barltrop & Wolveridge Muvver Tongue 32: A verminous person is ‘cooty’ and a person seen scratching him- or herself is likely to be asked ‘Have you got lodgers?’.

4. a baby in the womb.

1990		R. Doyle Snapper 142: She patted the lodger.
1993		P. Tierney Moon on my Back n.p.: One fellow might say to the other: ‘How’s your mott’s belly fixed for a lodger?’ and the other fellow might respond: ‘Your lozenger is not big enough to give a lodger to a flea!’ [BS].
2016		http://www.slang.ie 🌐 Howz Yer Belly For A Lodger. Fancy havin a baby.