GOLLY, BY

a mild exclamation expressing surprise, wonder, puzzlement, pleasure or the like. By golly is a euphemistic alteration of by God. —PDC 2 Approved Glossary

(colloquial) an expression used to show one's surprise, disbelief, annoyance, etc. We may not know the right things to do, but by golly, we know the wrong thing to do about any given circumstance or situation, and that's to do nothing.