“Jesus christ lads, that would blow the tits righ aff ye”- I guess the meaning is: “The vodka is so strong, it would blow the tits right off you” or something being so impactful it would blow the tits right off you.
“Sure I’m fucking flat out”- meaning: I am busy
“I’m up the walls”- meaning: I am busy
“You’re on the ball”- meaning: to have everything under control
“Ah go away!”- used in an (argumentative) dialogue- A: “The local politicians are building a new road!”, B: “Ah, go away, sure that road won’t be finished in your lifetime!” OR for voicing surprise- “Go away, they did not just do that!”
I am sure there’s more, but I’ll capture them as I hear them 🙂 If you know any, leave them in the comments! 🙂