Anyone you're living with who won't let you sleep, give you privacy, makes too much noise, tries to throw cock blocks when you have someone you're interested in over, borrows your clothes without asking, takes up too much time in the bathroom, has their obnoxious friends over too much and is basically a pain in the ass to live with. These people are usually not right in the head or have a substance abuse issue or is just plain old inconsiderate. Any intolerable child.
My roomate makes too much noise when I'm trying to sleep. She's a domestic terrorist.
Dennise is a domestic terrorist. She tries to wear my sexy underwear and tries to steal my boyfriends.
I won't babysit that loud-ass kid. He's a domestic terrorist.
My husband always has the TV up too loud. He's a domestic terrorist.
I had to break up with Danny because he'd get drunk at night and do a bunch of noisy and obnoxious shit so I couldn't sleep. He is a domestic terrorist.