Definition of "deepie"

For their first "deepie" — as the 3-D films have been christened in some quarters — Universal-International chose outer-space and the result is an interplanetary, pseudo-science thriller It Came From Outer Space.

1954, F. Maurice Speed, Film Review, page 155

See House of Wax in 3-D if you want to be entertained. It ranks with Inferno, Kiss Me Kate, Hondo, Creature from the Black Lagoon, and Dial M for Murder as one of the best deepies ever made.

2006, John Howard Reid, Great Cinema Detectives