($22) AQo in BB, big stack raising, push or fold?

Raiser had been fairly aggressive stealing a good amount of pots and calling a lot of raises. I took awhile and felt a little sick when I clicked the fold button. Is this a push?

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (6 handed) FTR converter on zerodivide.cx (http://www.zerodivide.cx/converter)

MP (t4770)
CO (t985)
Button (t3260)
SB (t1035)
Hero (t1760)
UTG (t1690)

Preflop: Hero is BB with Q/images/graemlins/spade.gif, A/images/graemlins/heart.gif.
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to t500</font>, <font color="#666666">4 folds</font>.

[tigerite]

If he's been stealin a lot of pots, I let 'er rip here, and shove.

It's a push, you have a good hand and now is the time to stand up to the bully.