skid lid

Skiddies is British slang for underpants, typically men's underwear. The term is informal and slightly crude, playing on the association with skid marks (the staining left inside underwear). It sits in the same register as 'grundies,' 'kecks,' or 'shreddies' as affectionate or jokey names for underwear. The register is laddish and informal; it's the kind of word you'd use among friends rather than in any formal context. Common in British English across age groups.

(slang) A cap or hat.

British military slang from World War I referring to the steel helmet worn by soldiers — the Brodie helmet or 'tin hat.' 'Tin lid' follows the same logic as 'tin hat,' playing on the shape of the helmet as a lid placed on the head. The term captures the irreverent, dark humour soldiers used to cope with harsh conditions. Outside military history contexts it is rarely used today, though it appears in WWI memoirs, letters, and fiction.

(UK, slang) Underpants.