How bad is this? Villian is unknown but the shortstack suggests a donk. The flop cold call screamed flush draw to me.

Party Poker No-Limit Hold'em, $ BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($200)
UTG ($302.30)
MP ($111.12)
Hero ($194)
SB ($132.90)

Preflop: Hero is Button with K, J. SB posts a blind of $1.
1 fold, MP calls $2, Hero raises to $8, SB (poster) calls $7, BB calls $6, MP calls $6.

Flop: ($32) J, 2, 8 (4 players)
SB checks, BB checks, MP bets $9.93, Hero raises to $30, SB calls $30, BB folds, MP folds.

Turn: ($101.93) 6 (2 players)
SB checks, Hero bets $95, SB calls $94.90 (All-In).

River: ($291.83) 3 (2 players, 1 all-in)

Final Pot: $291.83