A “scotch daddy” is an older, influential man in your life who commonly drinks/drank scotch. Usually they have introduced you to scotch, and now are the reason it’s your main drink.
Someone you look up to, and you’ve taken over their scotch drinking habit
person 1: who is your scotch daddy?
person 2 (drinking scotch in rocking chair): my dad’s best friend.. one day he let me have a sip and now i strife to be like him