An extremely expressive word that can be used in many situations.
On one end of the spectrum, "yeet" can be bellowed with a full, guttural sound whilst lobbing an object furiously to assert authority (great for water balloons and empty containers). On the other hand, "yeet" can be used gently, like the faint brush of a butterfly's wings as it crosses one's lips, as one completes a difficult task (i.e. boss in a difficult game, tough question on a math test).

I bet I can hit that bird with this rock. YEET!