@Big B P Good try on the "filly" thing ... this is actually dre's line, and in context he's just crashed his benz and is deciding which car to drive next "the monte carlo, el camino or el dorado / hell if i know". Stable is either his garage or chop shop
Most likely saying that his beats shake like waco, since Waco, TX has the Balcones Fault to it's North. It may also be a double entendre, referring also to the Waco incident linking it to Quake the videogame.
In reference to the id Software release "Quake" (1996); the line implies that the person in question has the aptitude greater than or equal to that of the Waco Kid's (Billy the Kid) firing abilities, in that they can quickly approach, defeat, and move on.
andre the giant is a reference to andre, a rapper in the song itself. mister elephant tusk is a description of andre, showing how famous and expensive he is. (elephant = big star) (tusk = ivory = valuable)