Sword Brothers are two males who have touched the tips of their penises together, thus sealing the bond of "Sword Brother"
by TheRealTycho April 06, 2017
"Olden times (greek/uncle?) when men would go into battle and would be like: We're sword brothers!!! So they would just fuck and bond cause they're sword brothers."
by TotallyTay727 October 19, 2016