Another AQ squeeze hand

[Choparno]

I still don't understand what these cold call-shoves mean from the BTN. I had just sat down so had no stats or reads on villain. Given that I am new to the table and an unknown, is this more or less likely to be a big hand? Hard to imagine villain anticipating a squeeze with something like KK since I have just sat.

If we are in BTN's situation, is this ever a good play with something like, say, TT against an unknown? I can't imagine doing this unless I am deliberately looking to trap an aggro squeezer.

No Limit Hold'em Cash Game - $3/$6 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $592.30
Hero (BB): $600.00
UTG: $217.37
MP: $487.40
CO: $1,220.16
BTN: $597.00

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, <font color="red">CO raises to $21.00</font>, BTN calls $21.00, SB folds, <font color="red">Hero raises to $96.00</font>, CO folds, <font color="red">BTN raises all-in to $597.00</font>, [i]Hero ?