It's actually "Looks like the big boy needs a little training!" I think you were very close to make a sloppy mistake there, with a little help from above 2 posters. You can here it @ 2:53 in this vid.
I didn't think 'the' really mattered, I looked it up on the starcraft wiki. and saw it but what;s the big deal between'the big boy' and 'big boy'.
There's three letters and a space of difference. A space. You know how big space is son? Seriously though, the difference isn't big but it's still there. I think he's gonna use it as a pet comment when he buys a Viking from the shop, and I see no reason for him to accidentally skip a word when it's a sort of quote he's looking for.
Pff, it's coo'. Would've found it out sooner or later, correct at first or incorrect. No need to apologize.