Green’s Dictionary of Slang

lower adj.

SE in slang uses

In compounds

lower house (n.)

the vagina.

Rambler’s Mag. Jan. 40/1: The said Sir C— W— shall be totally expelled their lower houses, and declared him totally unqualified to be a candidate for any of their burrows.
Rambler’s Mag. June 220/2: My utmost ambition is to be a member of the lower house where [...] I have no doubt I could render essential services to my country.
lower mouth (n.)

the vagina.

[Virgins Complaint 2: [We cannot] appease the hunger of our mouths beneath the wast, since the departure of the lusty young Gentlemen, Courtiers, and Cavaliers].
[UK]Harris’s List of Covent-Garden Ladies 125: The upper mouth he keeps constantly supplied with its favorite food, but we fear Jemmy has not parts suffieient to supply the lower with a tenth part of its necessary food.
[US]Maledicta IV:2 (Winter) 185: The anatomical relationship of the bower of bliss and its main channel is indicated in such phrases as the [...] lower mouth, the upright grin (except, traditionally, in China), a bit on a fork.

In phrases

lower than a snake’s belly (adj.) (also lower than a snail’s belly, ...a snake’s belt buckle, ...the spots on a snake’s ass)

1. (Aus./US) as low as one can go.

[US]Maines & Grant Wise-crack Dict. 10/2: Lower than a snake’s belt-buckle – Not very high.
[US](con. 1943–5) A. Murphy To Hell and Back (1950) 85: That lower than a snail’s belly of a gold-toothed slut.
[Aus]D. Niland Call Me When the Cross Turns Over (1958) 181: My opinion of you is lower than a snake’s belly.
[US]Maledicta 1 (Summer) 13: A man of low moral cal- ibre is lower than the spots on a snake’s ass.
[Aus]N. Keesing Lily on the Dustbin 177: He’s lower than a snake’s belly (or a lizard drinking).
[Aus]R. Beckett Dinkum Aussie Dict. 35: Lower than a snake’s belly: The person is. A dead-set bastard.
[Aus]G. Seal Lingo 127: There are [...] subtle gradations in the types of stupidity, thoughtlessness, hopelessness, incapacity and sheer ineptitude that may come in for verbal censure. A person may be: [...] lower than a snakes’s belly and lower than a snake’s belly in a wheel rut.
[UK]Guardian 10 July 3: You’re lower than a snake’s belly.

2. (orig. US black, also lower than a midget’s ass in hell) depressed.

[US]W. Smitter F.O.B. Detroit 237: I didn’t say nothing. I was feeling lower than a snake’s belly myself.
[US](con. 1916) G. Swarthout Tin Lizzie Troop (1978) 141: Nor did he give a tinker’s damn. He felt lower than a snake’s hip.
[Can](con. 1920s) O.D. Brooks Legs 66: I returned to the flophouse despondent, tired and hungry, my spirits lower than a midget’s ass in hell.
[US](con. 1940s–60s) Décharné Straight from the Fridge Dad 124: Lower than a snake’s belly Depressed.
lower than the belly of a cockroach (adj.)

used of a person categorized as the lowest of the low.

[US]I.L. Allen City in Sl. (1995) 46: Lower still is one who is lower than the belly of a cockroach, perhaps an original New Yorkism for the lowest of the low.
[US](con. 1940s–60s) Décharné Straight from the Fridge Dad.
lower than whale shit (adj.) (US)

1. extremely depressed.

[US]G. Legman Rationale of the Dirty Joke (1972) I 209: An American folk-simile: ‘lower than whale shit — and that’s on the bottom of the ocean.’.
[US]S. Morgan Homeboy 240: Fabbulous Frank slumped [...] feeling lower than whale shit.

2. (also lower than shark shit) of no moral worth.

[US]Maledicta 1 (Summer) 13: At the bottom of the heap is the individual who is lower than whale-shit-and that’s on the bottom of the ocean.
[US]W. Groom Better Times Than These (1979) 32: All second lieutenants were ‘lower than whaleshit’—which is at the bottom of the ocean.
[Aus]M.B. ‘Chopper’ Read Chopper 4 140: Bloody female screws are lower than shark shit.