Yam

1) To run up on someone and dunk on them while having little to no athletic capacity.

2) a sweet potato

*Derek runs up to a fellow class member at the beginning of math class(generally one of lesser height) and touches the wall above their head(custom is to have a vertical keep not exceeding 4 inches), dunking or “yamming” on said class mate*
He would then exclaim “Get yammed on!”