“Gabh i leith” means “come here”. When pronounced “goille”/”gulla”, it’s often the equivalent of “c’mere”, ie an informal “come here” that isn’t actually an order, just an announcement that I have something to say (“come here to me”, “come here till I tell you”).
“Cogar” can also be used in the same way.
“Gabh i leith, ar chuala tú faoi ….”
“Cogar, ar chuala tú faoi ….”