String bet question

[MaxPower]

I was playing 15/30 at the Wynn last weekend and I raised AQ pre-flop and was cold called by a crappy player.

The flop came Queen high. I bet and he called.

On the turn, I bet again. He took six red chips off his stack, reached out onto the table (over the line on the table where one would normally call) and placed the chips on the table without taking his hand off of the chips, then said, "Raise" and went back to his stack to get more chips.

Is this a string raise?

Everyone at the table including the dealer inisisted that it wasn't . Now here is the funny part, after inisisting that it was a string-raise I said, "reraise".