It is a sacred worship to our lord and Savior that involves grabbing a baby or fetus and send it to our lord with a either a throw or a kick and yelling 'Yeetus Fetus Deletus' or simply 'Yeetus fetus' or just 'yeet'. this sacred ritual should not be interrupted or the worshipers will send you up for your 'felonies'.
this is also a term for a common 2019 internet meme.
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.