Originating from 4chan, this phrase is a popular internet meme meaning "why hello there" and followed by "buttsecks". Commonly used to mock AOL Kids in internet conversations.
Pronounced: Yello-thar
Internet slang, translates into "Why hello there". Usually used in video games, forums, or instant messaging. It is the new, better way of saying 'hello' or 'sup'. Sometimes used in surprise.
Yhelothar bob, how are you doing today?
Yhelothar! I didn't expect to see you here my friend.