Yooo

Yooo is an informal interjection in English used to greet someone, grab attention, or express excitement. It is a lengthened form of "yo" with extra vowels to convey emphasis, friendliness, or enthusiasm. In writing, it appears as "yooo," "yoo," or "yooo!" and is often stylized with capitalization, punctuation, or repetition to signal tone.

Origins lie in the broader tradition of "yo" as a casual greeting in African American Vernacular English and related urban slang. The extended orthography "yooo" became common in late 20th century through hip-hop culture, online chat, and text messaging, where drawing out the vowels signals warmth or hype.

Usage is typically informal. It can function as a stand-alone greeting, as in "Yooo, what's up?" or as an attention-getter, "Yooo, check this out." It can also precede an exclamation or claim: "Yooo, that drop is insane." The tone ranges from friendly to exuberant and is often found in memes, streams, and social media comments. In formal writing, "yooo" is generally avoided.

Variants such as "yo," "yoo," or longer forms like "yoooo" reflect similar intent. The spelling is fluid and depends on regional or community norms, social context, and the desired conveyance of energy.