Green’s Dictionary of Slang

1. (Can.) a prison officer.

1989

J. Morton Lowspeak.

2. (US drugs) someone who hides drugs temporarily during importation from one country or area to another.

1989

(con. 1982–6) T. Williams Cocaine Kids (1990) 9: At the wholesale level, ‘transporters’ move large amounts across state lines to prearranged locations, where a ‘babysitter’ may keep watch over them.

3. (drugs) one who does not take hallucinogens, but acts as a ‘sober’ support for those who are doing.

1982

AS LVII:4 289: A guide does not use drugs during parties but serves as a controller, known variously as groundman, babysitter, tour guide, co-pilot, ground control, guru, travel agent, or just sitter.

4. (N.Z. prison) a paedophile.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 10/2: babysitter n. a paedophile.