He definitely said "trick cyclist" and I'm almost 100% certain it's Cockney rhyming slang. It's not just confined to a few miles of Bow's Bells or East London and it's always changing like most languages. For example you may hear someone say "have a butchers..." They are telling you to take a "butcher's hook" or a look. My favourite phrase is "I'm not listerine!" It means they are not "anti- septic"' or anti-American. The Brits call Americans "Yanks" and in Cockney rhyming slang they call Americans "septic tanks" or just "septics"  so  "anti septics" are anti American. I've been here in London for over 10 years and it took a bit to get used to the slang. It's a bit of a fun once you get the hang of it and then it easier to tell if someone's "taking the Mickey" with you. Hope that helps some