What does it mean when an opponent makes an odd-sized bet?

[fatdave]

I put this in the Psychology forum because it tends to throw me off the hand a little bit, because I really don't know how to react.

Does it mean anything when an opponent bets something like 1111 or 555? Does it represent them doing anything other than confusing me?

Additionally, does it usually signify a weaker starting hand (or bluff) when somebody bets an amount to "level out" their stack, say when somebody has 12938, and they bet 2938 (making their stack an even 10,000)?

A 222/333 example:

NL Texas Hold'em Tournament
Level:5 Blinds (50/100)

Seat 1 is the button
Total number of players : 10
Seat 1: Seat 1 ( $5246 )
Seat 2: Seat 2 ( $2740 )
Seat 3: Hero ( $1610 )
Seat 4: Seat 4 ( $617 )
Seat 5: Seat 5 ( $1345 )
Seat 6: Seat 6 ( $2245 )
Seat 7: Seat 7 ( $859 )
Seat 9: Seat 8 ( $2030 )
Seat 10: Seat 10 ( $1820 )
Seat 8: Seat 8 ( $6555 )

Level:5 Blinds (50/100)
** Dealing down cards **
Dealt to Hero [ 9d Kd ]
Seat 4 folds.
Seat 5 folds.
Seat 6 raises [222].
Seat 7 folds.
Seat 8 calls [222].
Seat 8 folds.
Seat 10 folds.
Seat 1 folds.
Seat 2 folds.
Hero calls [122].
** Dealing Flop ** [ Th, 9s, 3d ]
Hero checks.
Seat 6 bets [333].
Seat 8 folds.
Hero ???