Green’s Dictionary of Slang

gleep v.

[ety. unknown; ? link to clip v.1 (4)]

(US Und., motorcycle gang) to steal; often gleep a cage, to steal a car.

J. Paxton Wild One [film] I didn’t win it. I just gleeped it. But I gleeped it off of a guy who didn’t win it either .
in IUFA Fok Speech n.p.: Gleep — This word is used in place of steal [HDAS].