Spare Changing formerly known as Panhandling. It is a common practice amidst North American Homeless. Usually accomplished by "flyin' a sign" another common tactic beyond directly requesting financial assistance.
To spange (ask for spare change) from a stranger on the fly. As opposed to flying a sign, another form of spanging crack spange insinuates that it is being done spontaneous. Often done in the case of needing money for something immediately.
"I am ten cents short for a bottle of snake piss so Im gonna go crack spange on the way to the LQ.