As explained in this article, the story goes that once a couple close a padlock together, just as the lock cannot be unlocked, nor can their love and commitment to one another.
Kama nilivyoeleza katika this article, hadithi inakwenda kwamba mara kadhaa karibu kufuli pamoja, tu kama atakavyo haiwezi unlocked, wala hawezi upendo wao na dhamira ya mtu mwingine.