AKA the Bird or middle finger. Derived from a feminist request to refrain from clapping and use jazz hands to show appreciation at a conference to as to not 'trigger' attendees by clapping.
SJWs want us to use Jazz hands instead of applause, let me show them my Jazz Finger.
Klaxons Slang (Anglo-Klaxon) This is when people are guitar-wanking (showing off a song.) Although it doesn't have to music-related - just something over the top and unnecessary.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.