When I was a teenager in a rural island a local would always call out "Hey, your wheels are turning!" My retort was equally obvious: "Catch anything?" He was by far the most prolific fisherman I'd ever seen, catching a bunch of good sized stripers, bluefish and weakfish every time he went out in his little jon boat with a rod and reel.
Nowadays I mostly hear "Wanna race?" from young guys in pickup trucks. Sometimes I manage to scoot across the intersection before them, if it's not a wide multi-lane boulevard. Usually surprises them how quickly a bicycle can accelerate.
The nighttime group rides I join a few times a month mostly get good natured honks and shout-outs from locals who are friendly toward cyclists, or have joined these groups occasionally. Over the past year I've heard maybe two or three unfriendly catcalls. Those are far outweighed by the positive responses.