Table has been loose and active, we're 3 orbits in and down about $400 after 3betting/calling a 4bet and folding on the flop.

V1: a loose fish who has been calling a lot of raises but hasn't raised much himself

V2: co who overvalues pot odds, is too loose overall, and loves to talk about poker / thinks about hands, but is stupid about it

V3: small blind who is a tilting old man who may be solid but unknown?

V1 opens to $20 in HJ, V2 calls, hero raises to $80 on the button, V3 calls the $80 cold after a small pause, V2 looks at his cards and calls.

267 ($320)
Checks to V2 who bets $160, I call, V3 calls, V1 calls (v1 is all in)

Turn: 5 ($920)
V3 quickly goes all in for $260 more, V2 calls with $600 behind, hero (covers)...

Snap fold.

Ya pretty easy fold. If they happen to just be spazzing out then so be it.

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More pre. Idk what’s even happening post tbh but shouldn’t you be raising flop to get hu?

what? if you are raising flop here, you are pot committed....which means if you were behind, raising is always bad, if you were ahead, you raised and others will fold...you want the exact opposite

and as for OP:
i dont think i'd be too happy to call flop vs a donk leading into multiway 3b pot
i probably fold flop myself, if he had some random hand that blew your hand away on the flop, you've gotta give him credit for such play and take note for future reference...
you're repping AK, QQ+ since live 3b = premiums, so it's a pretty easy fold after thinking about it

i dunno what kinda games you are in, but the games I'm in, players leading out into multiway pot screams strength, leading into 3b mulitway pot screams massive strength, also there's a guy(v3) who cold call 3b pre which usually screams KK/AA

also i probably just flat pre instead of 3betting...
also "V1: a loose fish who has been calling a lot of raises but hasn't raised much himself "
when you give such description, it means tight raising range, which means 3betting tends not to be so good with JJ against tight raising range
3betting premiums vs such villain is best

So let’s commit then as the final raiser preflop w an OP on a nothing board in a 3bp with $500 in the middle against a bunch of loose fish.

I don't think $80 pre is terrible, but definitely not enough in this situation. Maybe $90-95 since these guys are calling too loose. V1 is short (less than 40 bigs) and we should be happy getting all of his money in here. Need to pay attention to his stack size and leverage your raise against the other players with a vulnerable hand multi-way. If your raise folds everyone out, including V1, then you just made an easy $47 with JJ. Sounds like a win.

As played, post flop, I agree with a flop raise. If V3 cold flats behind then you can probably shut down, especially on that turn card, but a lot of V2's range here consists of 55-TT and middle SCs. I don't think a donk bet should turn you passive unless you have a really good read that he only does it with 2p+.

This for sure. Flop is raggedy but str8 draw heavy...if we are continuing here we need to raise and thin the field.

AP, easy fold OTT especially after V2 calls. One pair no good. 98 and 34 got home, two pair hands everywhere and all the sets. You may have 2 outs to a win.

How deep is everyone playing? I feel like that's pertinent?

ya this. If we started 100bb deep then jam the flop facing that donk lead. If we're closer to 200bb effective than the flop gets really tricky and I'd probably call.

As played easiest fold of your life on the turn.

Posting this hand without stack sizes

Stack sizes are implicitly stated in the OP.

V1: 80+~160 = 240
V2: 80+160+260+600 = 1100
V3: 80+160+260 = 500

Yeah I figured stacks were implied, but thanks for spelling it out cheese.

Results for those who care about such things

Don't quit that game!