A situation where events happen so quickly that it is hard to keep up
Chris: Man, so how was the party?
James: Pretty regular at first: music, drinks etc. Then all of a sudden there were girls wrestling in a pool of jello, while some kids were throwing bottles at the idiots swinging from trees, onto the trampoline and into the mud bath. Then the police showed up and everyone just kept on going.
Chris: So pretty dynamic then
James: Err... dymanic more like.