大姨夫的大姨妈大姨妈的大姨夫

This is a playful way to describe relationships among family members. In China, “dàyimǔ” refers to your mother’s sister-in-law and “dàyímā” to your maternal aunt, so this username humorously switches these terms between each other. There’s no direct cultural translation since the names are specific to Chinese culture's nuanced terminology.