If a high ball was dropping into the goal area in a GAA match, this is a shout from the big man on the team letting other weaker players know he is about to jump for it.
term of encouragement, usually when forced to drink something unpleasant. e.g. "but I hate vodka 'n' red bull, it makes me boke" , "ach, houl yer wheesht and horse it into ye"