Green’s Dictionary of Slang

gleep n.

[ety. unknown; HDAS suggests ‘perhaps intended to represent a Chinese speaker’s pron. of creep n. (3)’; but note Time 25 Aug. 1947, 74: ‘Britain’s first pile...began operation last week. Officially it is a gleep (graphite low energy experimental pile)’]

(US campus) an odd or stupid person.

[US]Berrey & Van den Bark Amer. Thes. Sl. (Supplement).
[US]R. Serling ‘The Whole Truth’ in New Stories from the Twilight Zone 11: That old gleep with the model A!
[US]Current Sl. I:2 3/1: Gleep, n. A backward person, a ‘clod’.