AA (African American) slang for a person who sells out/betrays another person (or people) for something frivolous, often times intangible for self gratification. The often intangible, frivolous reward is what sets it apart from a Snitch. It comes from C.S. Lewis's tale of "The Lion, the Witch, and the Wardrobe," and the name is referring to an event in the book involving the faun/satyr that goes by that name. While it is really Edmund that sells out Mr. Tumnus for candied desserts, his name could be confused with any Edmund or was possibly not memorable enough, as the event is referred to as Tumnus instead.
"Them Top Brass in the Gov seats all be Tumnus for selling out their people's wants and needs for spa & botox gift baskets."
"Fuckin Tumnus outed her transfriend for existing to the police for 15 minutes of fame on TV! Now Barb is being passed around through foster care instead of her loving, supportive family!"
"You sell me out for what? A pat on the back from a father that never wanted you? You fuckin Tumnus!"
by RapaciousRampage March 3, 2023
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When an impact on your knee causes it to invert and you have to walk like Mr Tumnus from Narnia
John slide-tackled James and tumnussed him
by Acampbellblack August 2, 2023
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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!'
by TrainBoy96 March 11, 2023
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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."
by LGT 420 February 5, 2010
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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!
by BigDaddy231 July 17, 2015
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