Icelandic clap

The moment male genitalia bang off the top tube or crossbar of a bicycle. This action is usually accompanied with an immediate and significant exhale of breath and a lot of expletives, and is then followed by no intake of breathe for a good 5 seconds and more extreme cases this pause in breathing can be significantly longer. For a variable period of time after the incident, it is quite common to be forced to walk with an unusual gait.

Look that guy's walking like John Wayne ! Ah, he's just had an Icelandic clap episode bike-riding.....