In modern digital slang, social media commentary, and informal text messaging, the acronym "gbu" stands for the phrase "God Bless You." It is commonly utilized by online users as a warm, affectionate, and positive sign-off to express sincere goodwill, kindness, comfort, or blessings toward friends, family members, or acquaintances. People frequently type this abbreviation to respond to positive life milestones or to offer supportive thoughts during challenging personal moments.