Well, A&O, as an inveterate automobilist (but also an ex-cyclist) the great bane of my life is "a nerd on a bike," of which there are many even if they are not the majority. (Good cyclists don't get noticed - it's only the bad ones that have high profiles.)

I have recently come across a term of abuse which, from context, means someone who is stupid to the point if criminality - a "Twonk." Very expressive, don't you think?

Has anyone else heard this (I've heard it from two completely separate sources) and, if so, have you any ideas on its provenance?

I love your moniker - but where's your profile?