Villain – Loose calling station heavyset guy in Kentucky Basketball Hoody. Probably in his 40s, friendly.
Villain was basically calling pre with ATC – would call flop cbets with any piece looking to spike a 5 outers.
One significant hand prior. A TAG opened for $25 and only V called from the blinds. Flop was J-10-6 r and TAG bets $30 and V calls. Turn is a 6 and TAG bet $75 and V called. River was an 8 and V now leads for $100 and TAG ends up making a crying call with QQ and got shown 9-6 soooooted.

Stacks – Hero $700
V covers

So my hand I pick up AA in mid position and open for the table standard $25 (I opened 2 pots prior for the same amount). 3 callers including V from the BB. Flop is 7-7-5 r and BB checks to me and I bet $60 and only V calls. Turn is a 5 and we both check. River is a 5 and V leads for $200. Hero? It is early in the night and I have only seen the one showdown above but have already seen V involved in many hands to know he’s super loose pre. The question is, will he ever be making a move at a pot like this without a 5 or 7? I beat everything else…….

Without knowing more about villain there is no way to know. Some will make a move knowing you don't have many 7X or 5X in your range, more won't.

My inclination is to fold to the pot sized bet. Pay attention to how often he is betting river and let somebody else pay to find out if he will make big bluffs or not. It's a judgement call though and I could get stubborn here if I feel he is bluffing or is bad enough to bet an over pair for value.

Bets $100 into $250 with trips on paired board OOP and then bets pot into a paired board OOP against you! With being overall loose and the sizing tell, I'd call happily!

I would fold. His line is passively nutty.