1) A state of poverty that one can not generally escape, such as slavery or homelessness.
2) A type of sexual roleplay involving homeless people, generally unwillingly. i.e. rape.
3) A combination of both, a homeless sex slave.
As Xavier the Renegade Angel looked upon the homeless men, he asked inquisitively, "Why do you lie about in vagabondage?".
Sally is totally into "vagabondage", especially when it involves week old open bean cans.