Definition
"Gaga" can describe someone who is silly, foolish, or slightly crazy, often in a playful or affectionate way. Think of someone acting giddy with excitement or someone who is infatuated with another person. It suggests a lighthearted form of silliness. It can also mean old and frail. It differs from serious mental instability in that it implies a temporary or playful state. The term is highly informal. 😜