Big overbet into me on flop

[ahnuld]

playing some party 400nl 6max. Villan is a weird player, probably bad, but noone has looked him up yet. Hes made a few big overbets, but I dont know if he does this with solid hands or what.

Anyways, I get QQ and raise to 20. Poster folds, villan calls in BB. Flop comes 854 rainbow. Villan bets 150 into the 40 pot. Effective stack size is 350 total.