1. To shake, knock, or rattle against one another within some space. Make sure those bottles are all secured tightly. I don't want them jostling around during transit. We all jostled around in the back of the van as it wound back and forth along the mountain road.
2. To push, knock, or rattle someone or something around. In this usage, a noun or a pronoun can be used between "jostle" and "around." Now, make sure you don't jostle around the stuff inside this container, or it could explode! Various protestors and reporters kept jostling me around as I tried to make my way to the courtroom.
3. To exist in a fleeting, chaotic, or inchoate manner, especially within one's mind. I've had the idea for a novel jostling around in my head for the last couple of years, but I've never sat down to start writing it. Memories of the previous night jostled around in a hungover blur.
jostle someone around
to push or knock someone around. Please don't jostle me around. Don't jostle around everyone!