http://yellkey.com http://yellkey.com is designed for exactly this use case, and is near-exact clone of the now defunct http://shoutkey.com http://shoutkey.com

http://yellkey.com http://yellkey.com is designed for exactly this use case, and is near-exact clone of the now defunct http://shoutkey.com http://shoutkey.com that was prevalent at our school for this. It provides single-word short URLs that expire after 24 hours, which is fine in practice for any in-person use case.