Dirty, opportunistic hippies are like rats, you usually have to bring in some catlike behaviors to start preying on them regularly or burn the house down altogether.
If you harsh their vibe in a very dickish way on the absolute regular, they will leave. I'd personally start being the worst person you can imagine. Overfill that bong with piss so that their next first rip is a mouthful of rancid urine. It's your bong, you'll do what you want. Sprinkle cayenne pepper on a nug and leave it out too so it's a double whammy. If they sit down, spray them with a water bottle like they're a cat that isn't allowed there until they get off and call them "Dirty mongrel" instead of their name. Take the TP and toilet seat into your room with you at night. Take all the dishes and such they leave around the house and pack them in their drawers, shoes, bags, personal effects, etc. Have impromptu Bam Margera impressions where you wake them up with motorized vehicles indoors, pot & pan concerts @ 4am, and constantly throw their shit away the second they leave it someplace...
I mean come on. Use your imagination. You're asking for advice on how to flush out nonviolent peoples of little to no means. You should be taking this as an opportunity to be the total asshole that part of you always wanted to be! I say have fun with it if these assholes are going to take advantage. Videotape as much as possible, and start torturing these lazy vagrants without mercy for fuck's sake.
