600nl:turned 2 pair, heavy action

[piriformis]

***** Hand History for Game 5688905378 *****
$600 NL Texas Hold'em - Monday, February 19, 04:42:21 ET 2007
Table Jackpot #1304636 (No DP) (Real Money)
Seat 5 is the button
Total number of players : 6
Seat 3: itaka_yomone ( $513.35 )
Seat 4: HERO ( $649.80 )
Seat 6: gaston1222 ( $643.60 )
Seat 1: ibi24 ( $952.05 )
Seat 2: AAarrrrIN ( $600 )
Seat 5: Marcinho333 ( $470.80 )
gaston1222 posts small blind [$3].
ibi24 posts big blind [$6].
** Dealing down cards **
Dealt to HERO [ Kc Jc ]
AAarrrrIN folds.
dominic5454 raises [$18]
Marcinho333 folds.
ibi24: sorry...
gaston1222 calls [$15]
ibi24 calls [$12]
** Dealing Flop ** [ Ah, 4h, Jh ]
gaston1222 checks.
ibi24 checks.
HERO checks.
** Dealing Turn ** [ Ks ]
gaston1222 checks.
ibi24 checks.
HERO bets [$42]
gaston1222 calls [$42]
ibi24 raises [$137.97]
HERO...?

What does villian have here? is it always something huge?