Hate min-raise/min bets... what do they mean?

No reads on villian. I appreciate my turn bet was poor, but that's the point of this post. Why does he donk min-bet here? Is he drawing to something or does he have a monster?
I suppose there's no real draws here so do I assume he has me beat or am I weak here? I'm not really after comments on my play cos I know it was poor already on most streets. But why does he min-bet the turn what could he hold?! I hate donk bets...

Party Poker No-Limit Hold'em, $ BB (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

CO ($22.50)
Button ($19.70)
SB ($51.42)
BB ($10)
UTG ($24.40)
UTG+1 ($30.45)
Hero ($32.90)
MP1 ($28.95)
MP2 ($9.90)
MP3 ($25.70)

Preflop: Hero is UTG+2 with A/images/graemlins/club.gif, Q/images/graemlins/club.gif. SB posts a blind of $0.10.
<font color="#CC3333">UTG raises to $0.5</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $1</font>, <font color="#666666">1 fold</font>, MP2 calls $1, <font color="#666666">5 folds</font>, UTG calls $0.50.

Flop: ($3.35) 8/images/graemlins/diamond.gif, J/images/graemlins/heart.gif, A/images/graemlins/spade.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets $0.25</font>, <font color="#CC3333">Hero raises to $2</font>, MP2 folds, UTG calls $1.75.

Turn: ($7.35) 6/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $0.25</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#CC3333">UTG raises to $5</font>.

Final Pot: $14.35

[Riposte]

They mean they have overcards or a middle/low pair.

[rikz]

Call the turn and make a blocking bet at the river. Typically min-raises are either (1) good, but not great hands that villain wants to "raise for information" with because he read about that in a book somewhere, but not good enough to make a significant investment in chips to really get the information that he is looking for (underpairs pocket pairs, 2nd button, unpaired overcards, Axs with a low pair, TPWK, etc.), OR (2) a really big hand that villain is trying to get you to put a little more money in without scaring you off. My least favorite type of bet in category (2) is when somebody leads into me on a flop in which I was the preflop raiser with a $1 bet, then re-raises me all in after my continuation raise to about 3/4 pot over his $1 bet (I fold and laugh at that one).

If villain has a type (1) hand, he'll probably call your blocking bet and you'll win. If villain has a type (2) hand, he'll probably get greedy on the river and overbet - allowing you to fold out (unless you have a read on villain as making big river bluffs before).

[FlyingStart]

It's what comes out when they press the raise button

[yvesaint]

[ QUOTE ]
It's what comes out when they press the raise button

[/ QUOTE ]