To "Ghost Ride" is to exit a moving vehicle and dance around and/or on it. You often hear about this in terms of "Ghostriding the whip." Whip is a car, generally a crappy one, like a scraper.
References related to Oakland:
- Ghostride My Volvo by two Head Royce students
- E-40's song "Tell Me When to Go" which features Oakland rapper Keak da Sneak
- Oakland rapper Mistah F.A.B.'s hit song "Ghost Ride It"