If you thought Arthur couldn't get any redder, you were wrong. Is it too late to backtrack and take the 'run away and build another raft' option?

Unfortunately, he's at least a decade too early to be familiar with that slang, and while he could usually figure it out from context, his brain is already running a few too many parallel processes right now, including the other thing Bash just said, and an extra one might crash the whole system.

So his response is to repeat "Straight?" like he's never heard the word before in his life, which is reasonable enough, but probably doesn't make the situation any less funny.