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1.
Dr. Laura's blunt and intemperate way of referring to any couple that cohabit without benefit of marriage. Also, and in particular, any woman who "puts up with" such an arrangement, regardless of whether or not marriage is in the foreseeable future. See under mistress.
Caller begins by saying: "Dr. Laura, here's my problem. I've been living with my boyfriend for six years, and--"
Schlessinger interrupts: "So you're a shack job."
Caller (hesitantly): "Well..."
Schlessinger: "OK, we've established that. Let's move on..."
by Steve Salerno May 23, 2008
 
2.
a lover that lives with you in your place, but could be used to mean your lover in general.
Archibold: if that shackjob ain't done tidied up my crib and got me some hot pie for me to nibble on when i get home i'm gonna tear her a new asshole.

Percival: yeah man, you too easy on that freeloader
by matthew bates June 01, 2005