As a current Harley rider - he could've also meant "slow down" in a tongue-in-cheek sorta way! I am a low waver also but I'm so short Everything about me is low to the ground - even my Harley! Don't feel uncool - you smiled and waved back - thats all that mattered! Most Harley riders use only 1 insulting gesture - everything else is fun/happy! As for being fun and friendly - I've never met an unfriendly Harley rider and that includes the Hells Angels which rode in every charity ride my old AZ chapter put on.