Liquid Jim is a screwball comedy about a lonely junk collector who falls for a cautious psychology major with OCD.

Don't include the title of your film IN the actual logline - the title should be presented in addition to the logline. Likewise, the way your logline is written should indicate tone and genre, so you shouldn't explain that it is a screwball comedy. That's more information for the pitch.

So, it's a lonely junk collector who falls for a cautious psychology major with OCD. You've gone full quirkilicious with your characters, which is fine ... but it's not clear what the event is that sets off your story, what the goal of the junk collector is, what the stakes of your story are ... or even why or how these two would connect.

What about the idea that the hoarder has a legal document that the neat freak need but that fuel to an earthquake the document is somewhere under a pile of junk but he can't find it.

Another possibility could be that as part of their psychological therapy they are assigned as buddy and are supposed to help each other. That may stray too close to "Silver Lining Playbook".

After the collapse of his marriage, a meek driving instructor developed compulsive hoarding. As part of a buddy system he now has to help his nemesis: a beautiful woman affected by the compulsive need to clean and tidy things.

There's a show in the uk that may be helpfull, it's called "obsesive compolsive cleaners" it's made by channel 4.
It's about OCD types going into really grubby, or some times people who horde.

From a few shows i've seen, a horder can disguise the fact that well, that you could work with them an never know. An office romance could bloom with neither party being aware of the others disorders. They could easily make up excuses as to why they don't want the other in their home, but up some time, they'll have to let that person in.

A critique of a logline entails the validity or appropriate use of facts.

As I said, I think your core concept has dramatic possibility. I would like to see it fully realized. My personal reaction to the story so far is that the OCD is the more compelling of the 2 characters, the one with the more dramatically interesting complications and problems. Maybe that's because of my experience with them. Be that as it may I can see her stealing every scene she's in. You have potentially rich raw material to work with. fwiw.

I wasn't saying it was. I really don't want this to become an internet flame war over psychological disorders. I'm only here for critiques on my logline, and the girl having PTSD isn't even a definite part of the story, more a thought on what could connect these two characters.

The key phrase in my statement was "For the most part". Of course, many people suffer from symptoms of PTSD. I know. Working in mental health, I engage with them frequently. I also engage with people suffering from OCD which, for the most part, has a distinctly different etiology and symptoms. (Check out the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, aka:DSM-5)

>>suddenly you can't stop eating all the time.

But that's not OCD. You're construing apples as oranges.

My point is not to get into a pissing contest over definitions. I think your concept has interesting potential as a story IF it remains true to the actual nature of OCD.