A common practice among Jeep owners, it is a variation of the Jeep wave seen commonly in southern California, and especially amongst Marines. It is characterized by two fingers extended from the steering wheel and a slight upwards nod as two Jeeps pass one another. All non-Wrangler Jeeps and other 4x4's are excluded from Jeep love, as well as 4 door JK's (unless the owner seems to be serious about taking it off road and not looking like a douche).
TJ driver: "Yeah, so I was... hold on a sec" (throws up some Jeep love for a passing YJ)
Passenger: "What was that?"
Driver: "Jeep Love"