“Tying the knot” is a common phrase that means “to get married”. The origin is debated but the most likely case would be the days of Celtic paganism. The wedding ceremony would typically include a hand-fasting where the couple’s hands would be tied together to symbolize the union of the couple.
Congrats, Adam! I understand from reading between the lines here on your blog that you and your love got married! I can’t find if there was a post which specifically announced that, but I hope you will be very happy together!