The phrase "lost boy in Wonderland" refers to the classic character, Alice, from Lewis Carroll's "Alice's Adventures in Wonderland." In the story, Alice falls down a rabbit hole and finds herself in a strange and fantastical world filled with peculiar creatures and characters. She becomes "lost" as she tries to find her way back home, encountering various obstacles and challenges along the way. The story has become a cultural icon and is often used as a metaphor for feeling lost or out of place in a confusing or unfamiliar situation.