1. noun: A 'know-it-all' who actually does know it all. They have a mind filled with trivia on almost every subject. This term comes from a character on 'Cheers', Cliff Clavin, played by John Ratzenberger.
2. verb: The act of injecting unnecessary, but true, facts into a conversation.
1. noun: "When it comes to knowing random facts, you are such a Clavin."
2. verb: "You don't have to Clavin everything I say."
Way back when in the 1800's when there were slaves, the black men were known to have a clavin also know as a huge penis. The white men were very jealous beacause the black men would sleep with there women and pleasure them greatly with their lage cocks.
back in 2005 we had an assistant princapal named mrs. bitch. patrick she used 2 have a clavin. so did another nigga named kimberley smith suck on my big clavin.
a clavin is a huge black penis 10 inches or larger
my personal favorite