Y ALO THAR! Share definition Flag Y ALO THAR! is the best internetphrase ever, it means ''Hey, hello there!'', and oftenly people ask for buttsex after saying Y ALO THAR! Britney Spears: Hello everyone, I am Britney. Troll: Y ALO THAR! BUTTSEX!? Y ALO THAR! by Timmeh!!! May 4, 2010 0 0 Get merch Get the Y ALO THAR! mug. Buy Now — $32.95 See more merch