Fuslie & Miyoung Scold Sykkuno On His Pronunciation Of "Wagyu" 

I’m pretty sure that he heard them and was trolling.

Yes! And, the "a" in the "wa" sounds more like an "ah"... Not like the "a" apple like the girls are saying.

So the kanji is 和牛 so in grade school kana it's わぎゅう which is (wah, gi, yu, u) u being like the oo's in boo and in kana when ぎ (gi) and ゆ (yu) are together you drop the i from gi and it becomes gyu. So the romaji would be like wahgyuu. Like Graham is saying it's more of a wah like a guitar wah wah pedal but also the extra u (oo) at the end is important, just like not breaking the 2 syllables up and they don't emphasize either like we would on the g. Now that I over complicated it you're welcome.

Because English doesn't usually have gyu back to back like that, so I'd assume it's a different Language where the y is silent

They're not even pronouncing it like 'who'