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Synonym to anal sex in different Finno-ugrian language groups.
Hey baby, you wanna have Mattis tonight?

" I had the best Mattis of my life yesterday".
Mattis by Jari Suomi August 8, 2009
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Mattis is a character in the book Ronja Rövardotter, by Swedish author Astrid Lindgren. Mattis is Ronjas dad and robber chieftain. He lives with robbers, his wife and daughter Ronja Lovis in a large castle that has been divided by a lightning strike. He is a person with strong emotions, he was bubbling with happiness and pride when Ronja born, when he is angry he throws things around him and he becomes fully enraged when Ronja befriends the son of his worst enemy, Borka. In the film version portrayed by actor Börje Ahlstedt.
I liked that Mattis character best!
Mattis by Dr Fittneger February 5, 2010
The Mattis is an act used to seduced a female. The male (usually a bro or tool) begins making out with the female and then proceeds to reach around to her ass and insert a finger into her butthole. This is an attempt to use the Shock and Awe factor for anal stimulation. It is best used in situations when both parties are drunk.
"Dude why'd that girl slap you?"
"I tried to pull a mattis"
mattis by LaxPermit February 27, 2012
Mattis is a person that dosen't care about people. He is lonly all the time and takes it out on his students and he does not like to help in any way.
Student: hey, can you help me?
Teacher: no, i am not aloud to help
Student: Oh, your such a Mattis
Mattis by anonymous May 5, 2021
A dog with a juicy fat luscious bubble butt
Bro:bro how’s Mattis?
Me:who?
Bro: juicy fat ass dog?
Me:ohhh-
Mattis by Mattis.lover November 14, 2021
Damn! He’s a real Mattis!
Mattis by Jackblk22 November 22, 2021