Right on Hubby, that is a great link to explain the Jeep Wave that the OP experienced. Thanks! 
An honor bestowed upon those
drivers with the superior intelligence, taste, class,
and discomfort tolerance to own the ultimate
vehicle - the Jeep. Generally consists of vigorous
side-to-side motion of one or both hands, but may
be modified to suit circumstances and locally
accepted etiquette."
The Jeep Waving Hierarchy (JWH):
•Category A: Pre-CJ (Willys/Kaiser/Army MJ/etc)
•Category B: Pre-AMC CJ
•Category C: CJ
•Category D: Commando
•Category E: YJ
•Category F: TJ
•Category G: Cherokee, Wagoneer
•Category H: All other Jeeps
•Category I: All other 4WD vehicles
•Category J: All other vehicles
Is everyone educated on the proper way of the
JEEP WAVE!! at this time???