Dynamic of the 3handed game was off the walls, big pots, many bluffs and light 4bets.
Ok villain i an absolute donkey, been playing ultra agro when it got down to 3handed, but before that ran 59/24/2 over 100-20 or so hands, 3bets 20% of the time. Rarely folds to cbets and been seen bluffing in big pots before with air.

$0.5/$1 No Limit Holdem
3 players
Converted at weaktight.com

Stacks:
BTN scruffy mojo ($165.35)
SB Blue ($138.50)
BB Hero ($100.00)

Pre-flop: ($1.50, 3 players) Hero is BB
scruffy mojo calls $1, Blue calls $0.50, Hero raises to $5, scruffy mojo calls $4, Blue calls $4

Flop: ($15, 3 players)
Blue checks, Hero bets $11.50, scruffy mojo calls $11.50, Blue calls $11.50

Turn: ($49.50, 3 players)
Blue checks, Hero checks, scruffy mojo bets $49.50, Blue folds, Hero raises to $83.50, scruffy mojo calls $34

The thing is, last 2 times I saw him bluff, he flatted the flop just like in this hand.
Given all of the above, do you think this is a spew or a fistpump shove?