(Britain, informal, plural only) Underwear worn by a woman or girl during menstruation, typically old, cheap, or of a dark colour in case of staining.

plural of kick in the pants

(plural only) Pants (trousers) with a snug fit through the legs, ending in a small leg opening.

(slang) Relatively large or stretchy pants (trousers) that are comfortable even when smaller pairs would feel tight.

(slang) A diplomat or civil servant.

(idiomatic) An intensifier used with some transitive action verbs to indicate that the action is performed with thoroughness, vigor, or complete success.

(slang, vulgar) In a manner, or to a degree, capable of causing one to soil oneself in fear; terrifyingly.

flared trousers used for dancing

baggy, long pants tapered at the ankle, with side flaps on the hip that button at the waist area

(slang, derogatory, sometimes attributive) An excessively judgmental person.