An idiot on a bicycle - someone cycling and phoning at the same time without their hands on the handlebars and going through a red light or two generally causing chaos and neglecting all known traffic laws.
Look at that bidiot over there. I hope he falls of his damn bike and smashes his phone.
(verb) - when you didn't understand what someone said and don't want to ask them to repeat themselves multiple times and just guess that they said something funny and smile.
It was way too loud to make out what he was saying so I just guessmiled at him