Where does “pretty police” come from?

pretty police (English) comes from English police, from Middle French police, from Latin polītīa, from Ancient Greek πολιτεία, from Ancient Greek πολῑ́της, from Ancient Greek -της, from Proto-Hellenic -tāts, from Proto-Indo-European -teh₂ts — Creates verbal adjectives from verb stems.

pretty police (English): Male police officers disguised as gay men who instigated sexual encounters with gay men as an excuse to arrest them for soliciting sex

Definitions

  1. Male police officers disguised as gay men who instigated sexual encounters with gay men as an excuse to arrest them for soliciting sex

Ancestry of “pretty police”, step by step

pretty police traces back through two separate lines of ancestry.

via English police

StepLanguageWordMeaning
1EnglishpoliceA civil force granted the legal authority for law...
2Middle Frenchpolicegovernance; management
3Latinpolītīastate, government, administration
4Ancient Greekπολιτείαthe relation in which a citizen stands to the...
5Ancient Greekπολῑ́τηςcitizen
6Ancient Greek-τηςForms nouns representing a state of being; Added...
7Proto-Hellenic-tāts
8Proto-Indo-European-teh₂tsUsed to form nouns representing state of being
9Proto-Indo-European-teh₂Used to form nouns representing state of being
10Proto-Indo-European-tósCreates verbal adjectives from verb stems

via English pretty

StepLanguageWordMeaning
1EnglishprettyPleasant to the sight or other senses;...
2Middle Englishprety
3Old Englishprættiġtricky, crafty, sly, cunning, wily, astute
4Proto-Germanicprattugazboastful, sly, slick, deceitful, tricky, cunning
5Proto-Germanicprattuzboastful talk; deceit, trickery, stratagem, list,...
6Proto-Indo-Europeanbrodnó-to wander about
Every word from Proto-Indo-European -tós