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His efficacious but banal jocular pasquinade about the justice system used encomia, hypocorism, and jocund law-and-order argot.

efficacious: Producing or capable of producing a desired effect. See synonyms at effective.
banal: Drearily commonplace and often predictable; trite: “Blunt language cannot hide a banal conception” (James Wolcott).
jocular: 1. Characterized by joking. 2. Given to joking.
pasquinade: n. A satire or lampoon, especially one that ridicules a specific person, traditionally written and posted in a public place. tran. v. To ridicule with a pasquinade; satirize or lampoon.
encomium: 1. Warm, glowing praise. 2. A formal expression of praise; a tribute.
hypocorism (hiy-PAH-kuh-Ri-zum) n. 1. A pet name. 2. The use of pet names. DID YOU KNOW? “Hypocorism” was once briefly a buzzword among philologists who used it rather broadly to mean “adult baby talk,” i.e., the altered speech adults use when supposedly imitating babies. But what the Greeks likely had in mind with their word hypokorisma was simply pet names. (Pet names can be diminutives like “Johnny” for “John,” endearing terms such as “honeybunch,” or, yes, names from baby talk like “Nana” for “Grandma.”) Hypokorisma comes from the verb hypokorizesthai (“to call by pet names”), which itself comes from korizesthai (“to treat with tokens of affection”). English-speakers borrowed the noun as “hypocorism” (by way of Late Latin hypocorisma) in the late 19th century. Once the baby talk issue faded, “hypocorism” settled back into being just a fancy word for a pet name or the use of such names.
jocund: Sprightly and lighthearted in disposition, character, or quality.
argot: A specialized vocabulary or set of idioms used by a particular group: thieves' argot. See synonyms at dialect.