Police often ride horseback in larger hippie-gatherings such as Rothbury Music Festival and most Rainbow Gatherings, so as to parole large spans of land in a reasonable amount of time.
The term "g up gitty up" is designed to help unsuspecting hippies who are holding drugs, without incriminating yourself.
Spreadhead: "Oh shit! 6 up gitty upppp!!!"
Lot Kid: "Shit, I gotta hide these fucking doses"