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The act of suprising a random girl by putting two fingers up her butt in a public or social place, then when they freak out, to hold on to them around the waist with your free hand, 'riding' them for as long as possible while they struggle.

Source: B.O.S.C.
Giles: "Man I totally broke my finger Rhino Riding this girl at the pub last night"

Nick: "thats countch, how long did you last?"

Giles: "Was riding that badgirl for 14.5 seconds, a personal best!"
by BOSC June 09, 2011
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