Your washing load is predominantly cycling clothing. And you have to do 2 washes a week just to have knicks for the weekend.
You spend all day reading and responding to inane threads on some cycling forum on the Interwebs.
You know the wind direction and likelihood for rain before leaving the house in the morning.
6:30am is a "sleep in".
You freely use the following words in polite conversation before realising the potential innuendo: grinding it, bonking, "put it in the big ring", "riding the little ring", riding all day / night long, going hard, tail wind, sucking wheel, getting spat.
"Getting dropped" has nothing to do with breaking up with your current partner, but can be as equally painful and unpleasant.
You don't actually know what half your friends look like in civvies, having only ever seen them with sunnies and a helmet on, replete with lycra and riding gloves.
You recognise the current season based on the "smell" of the air outside.
Your LBS knows you by name.
You already know the solution to [Capital city of choice's] traffic congestion problem.
Some of your favourite TV viewing happens in July, long after you should have gone to bed.
Meeting up with svelte, attractive people wearing skin-tight clothing, on a street corner somewhere (even on cold Winter mornings ) is perfectly normal and acceptable behaviour.
White lines painted across the road make you a little twitchy...