Blinding an Irish Woman

Okay, listen up, you big lug. This joke is playing on a really old, kinda mean stereotype that Irish people, especially women in this case, love drinking scotch so much they'd forget about everything else around them if booze was involved. So, 'blinding' her isn't literal, it just means she'd be totally obsessed with the bottle. You're probably just as easily distracted by shiny things, aren't ya?