I have noticed this “new” line, coming from a lot of quarters, in the last week. It’s almost as if, wherever it is that “old man coffee” congregates, they all got together and decided to show the young whippersnappers a thing or two. Surprise. Surprise, It’s a slow play. But particularly confounding. I have seen variations of this exact play maybe ten times in three days. The hand below is the second hand in a week where I have been ensnared, this time for all my chips. Given the line, I never put V on two Kings. To my shame. Be advised.
Online .02/.05 5NL

Hero (SB): 137.8 bb AdAc
BB: 30 bb
UTG: 168.8 bb
MP: 120 bb
Villain CO: 144.2 bb
BTN: 69 bb

PreFlop: folds to Villain CO who raises to 3 bb, folds to Hero SB who raises to 9 bb, folds to Villain CO who calls 6 bb

Flop (19 bb, 2 players): Ks 5h 3s
Hero bets 6 bb, Villain CO calls 6 bb

Turn (31 bb, 2 players) 9d
Hero checks, Villain CO bets 29.6 bb, Hero raises to 122.8 BB and is all-in, CO calls 93.2 bb

River 276.6 bb, 2 players) 2h

Villain CO shows Kh Kc (Three of a Kind, Kings)
Villain CO wins 262.8 bb