NL25 - donk/bet/jam line on K334T - BTN v BB

* sry, CO v BB, doesn't change much though.

Hold'em No Limit[/color][/i] - $0.10/$0.25 - 6 players

UTG: $18.24 (73 bb)
MP: $25.64 (103 bb)
CO (Hero): $25.00 (100 bb)
BU: $24.65 (99 bb)
SB: $29.39 (118 bb)
BB: $35.86 (143 bb)

Pre-Flop: ($0.35) Hero is CO with Q♣ K♠
2 players fold, Hero raises to $0.63, 2 players fold, BB calls $0.38

Flop: ($1.36) 3♦ K♣ 3♣ (2 players)
BB bets $0.50, Hero calls $0.50

Turn: ($2.36) 4♣ (2 players)
BB bets $2.40, Hero calls $2.40

River: ($7.16) T♣ (2 players)
BB bets $32.33 (all-in), CO (Hero) ?

Opponent is a reg, altough unknown. Tagged him as a reg as he was 5tabling in the pool. Later saw stats displayed ~21/17/9 - on two of the tables.

Flop call standard on a paired board. Turn bet is strong, but I had a strong enough hand as well.
River: Was prepared to call a big bet with the flush, but OB JAM??

Is this always a boat? K3, 33, maybe the odd 34? Clearly I have boats in my range too and would play them passively, and he wasn't scared of it at all.

I do think he had the boat here and hoped that I bluffcatch with Kx or a flush and wanted to get paid big. The donkbet itself looks like he wanted to induce.

Still a strange line overall.