We are bosom buddies, but we can still get into a big fight every now and then.Oh, yes, Sharon is my bosom buddy.
bosom buddy
One's close or closest friend; a friend one holds dear to one's heart. We grew up right next door to each other, so we have been bosom buddies since we were kids.
bosom buddy
and bosom pal
a close friend; one's closest friend. Of course I know Perry. He is one of my bosom pals.