To get big, in criminal slang is, to sneak into a building or property illegally. Hide behind the door and wait for them to close to commit the crime. Whether it's stealing, killing. At night the doors are closed. I get cinged by day, I'm hiding and when they leave I steal. There are connotations of climbing, climbing, by a wall, a tree nearby, but it can be by the front door, walking. Whitening denotes furtivism, not violence. I mean, it's not going in breaking the door. Although the whitewasher will do anything to enter without being seen or heard or noticed, he may have to break something for it. Some synonyms, words or similar expressions may be sneaking in without being seen