"IRN BRU! Thank you, boy!"
Translation:IRN BRU! Tapadh leat a bhalaich!
Specifically, inflection for the vocative case (addressing someone). If it begins with a consonant, and that consonant can be lenited (b,c,d,f,g,m,p,s,t - or all except l,n,r) it is [balach -> bhalach], and the final consonant group is slenderized by the addition of an 'i' [bhalach -> bhalaich].
First time I drank it, I would have described it as 'sweet, sweeter, chemical'. (it was super overload to my taste buds) Its bright orange in colour too. Other than that, it's hard to describe it, it doesn't taste like anything natural (like lemons) , but also not like anything else I could compare it to? It's a distinctive taste though, a bit like an energy drink.