Saturday-night special

[sat-er-dey-nahyt, -dee-] /ˈsæt ər deɪˌnaɪt, -di-/
noun, Informal.
1.
a cheap, small-caliber handgun that is easily obtainable and concealable.
Origin
1965-70
British Dictionary definitions for saturday night special

Saturday night special

noun
1.
(US, informal) a small handgun that is cheap and easy to buy
Slang definitions & phrases for saturday night special

Saturday night special

noun phrase
  1. A cheap, small-caliber revolver quite easy to obtain: Detroit lawmen began to refer to the weapons as ''Saturday night specials'' (1968+)
  2. A person, often an alcoholic, who comes to a hospital on weekends seeking a bed and board (1970s+ Medical)

[Saturday night pistol, ''25caliber semi-automatic,'' is found by 1929]