It is to leave your name or tag up somewhere. In today'
s graffiti world it is a generalized term signifying earning a reputation by placing your moniker somewhere whither seen or not. Traditionally "to get up" meant to place one's graffiti name in a
high and visible location
like a Billboard, Rooftop or High Rise i.e. literally "Getting Up" somewhere
high and visible in a sometimes difficult spot for notable and street fame.