1-2 home game, Villain is 45 years old, bad player and known to table as big loser in the game. Tonight he's bought in several times already, and he's been shoving all-in preflop every other hand. The past couple times he's shown 89s and pocket 4s. He had been rebuying for 100 or 200, and now he re-bought for 300.

Hero has TAG image, slightly ahead on the session (bought in for 200 and currently at 325), won with aces earlier and hasn't played a hand in a while.

Villain raises to 15 in EP, MP calls, and MP+1 calls. Hero is in CO with A8 Hero raises to 55. Villain shoves all in, MP folds, MP+1 folds, Hero...snap calls?

What is our stack? Also, these tilt shove, have they all been open shoves, or have some of them been over raises? Has he been non-shove opening also?

Generally, I don't like the 3-bet to iso here unless we are sure V is basically on ATC, in which case we're obv planning to snap. We have a decent hand to play multi-way with some very nice implied odds. I'd probably just flat pre.

Our stack is 325. His shoves have been both - some open shoves, some after 1 or 2 callers, some after an open raise.

fold now, fold the first time, call is better than three bet

You got what you wanted, but I guess you didn't like the result. That's why LAG players are so swingy - when they hit, they win big pots because no one believes them. They live and die on that edge, mostly dying.

If he's genuinely shoving 50% of his hands, you're a 57/43 favorite against his range. If he's actually a little tighter, your edge is thinner but still there. (And once we factor in the dead money/pot odds, everything is sunnier still.) So in terms of EV, this has positive value, albeit with crazy variance. And you know that.

I'm guessing you posted because Villain either showed up with AK/QQ (the rascal!) or because he turned over J9o and hit a lucky board.

If you can expect to play this situation 50 times in your life, there's no reason to be results focused. If it was a rare chance with ripple-on consequences (you lose and go on tilt/go home when you don't want to, etc.) then Garick is right that you had another profitable line available that probably carries much less variance.

Yeah, unsurprisingly the result was bad, but I wanted to see if my play was bad or it actually made sense, and it's just unfortunate that he woke up with a real hand.

There is a difference between open shoving $100, $100 and $300. Usually, at least in my games, they'll shove <100bb very wide, but once they get deeper, they tighten up.