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Origin - Tumnus is the Faun from C. S. Lewis's "The Lion, the Witch, and the Wardrobe."
Verb - to tumnus - to "fawn" over someone or something.
I tumnus over Scarlett Johansson every time I see her.

She tumnussed all over herself when John Cusack showed up on screen.

Quit tumnussing, you're making me feel insecure.
Tumnus by Z.J.M. March 28, 2010
Mr. Tumnus is a riotous fellow, in addition to the chronicles of Narnia fellow. True, Lewis Carrol did mention the words long ago, but today's Mr. Tumnus is a go-getter. He has a son, a job, and drove a Trans Am with a 455 V8 in college. Often seen kicking ass and taking names, Mr. Tumnus co-invented drive-by groans, spew, smoking out of Presto cups, and a managerie of tricks awesome to behold. He is truly a one of kind American icon
Mr. Tumnus is our friend, he has rules, but they will bend.
tumnus by Bob September 18, 2004
taken from the chronicles of narnia, the lion, witch and the wardrobe. mr tumnus a half human, half goan man (faun) being divided at the pube line. when a mans pubic line is showing over ill fitting trousers, including pelvis lines this is known as his tumnus.
'look at bens tumnus!'
tumnus by mat'n'dave May 28, 2004
To tumnus is when someone drinks too much too fast, and is the first one at the party to pass out. Usually this person can be found somewhere very uncomfortable such as on the fireplace ledge, or on the backyard patio. They will usually wake up feeling like a woodland creature of some type.
1)"Hey, where did Scottie go? He has my beer."

2)"Dude, he Tumnused out in the bushes. We caution taped him off though."
Tumnus by LGT 420 February 5, 2010
A strange creature with fake legs, some suspect made made of surgical metal. This known inhabitant of Narnia, enjoys his garden and often receives visits from his male gendered "friends." No one is quite sure why he loves company so much. What's even more puzzling is how his company likes him so much considering his appalling hard to stomach appearance. This bearded creature is ill tempered and will easily reach for a firearm if offended, harmed, mocked, pissed, and etc. Basically if he can't handle his situation his trigger finger can.
You a Tumnus lookin' boy!
Tumnus by BigDaddy231 August 9, 2015
A modern term for when a man ejaculates on his own stomach, either by choice or accident.
'She was on top and pulled me out and I did a proper Tumnus!'
Tumnus by TrainBoy96 March 11, 2023