An appropriate definition to Nomadic is roaming about from place to place aimlessly, frequently, or without a fixed pattern of movement
From a hunger artist in the second paragraph
“The glaring light didn’t bother him in the slightest. Generally he couldn’t sleep at all, and he could always doze off a little under any lighting and at any hour, even in an overcrowded, noisy auditorium. With such observers, he was very happily prepared to spend the entire night without sleeping. He was ready to joke with them, to recount stories from his nomadic life and then, in turn, to listen to their stories—doing everything just to keep them awake, so that he could keep showing them once again that he had nothing to eat in his cage and that he was fasting as none of them could.”
Now that I have the definition and the context in which to put it,I can surmise that it means that hes never had a stable home.This could’ve also played apart in why he does the things he does.This also means that hes seen tons of things. Its possible that his nomadic lifestyle had a very profound impact on his psyche.