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The kind of guy that would dedicate his life to maths and even go live in a cave so that he could study maths.

Lasses also knows the answer to everything, but they won't tell anyone.
Person 1: Hey, have you seen a Lasse somewhere around here? I forgot to do my maths homework.

Person 2: Try the library, I heard they set up a camp in there to study maths.

Person 1: Thanks man, I'll go have a look.

Person 2: Be careful though, they might try to convert you to become one of them.

Person 1: Ok, I'll be careful then, don't really fancy becoming a Lasse
Lasse by In_need_of_autonumber March 7, 2016
Lasse is a person with an extremely small penis. Lasse is a person who is typically an alcoholic and smoker. Lasse is a person who dates younger girls under the age of 18.
Damn he is such a lasse
Lasse by lasseoste April 14, 2020
A brave man with a very big penisnad is super good at sex. He knows exactly what to do to make a girl wet.
Girl: ohh you are so Lasse.
Guy: I know.
Lasse by Thebigdickguy December 12, 2016
A nice boy which Is very big and Has a Quote good Charakter.
Look over there, do you see the nice boy? It's a Lasse
Lasse by FAKEACCOUNT December 29, 2016
It's literally just a name. At least in Denmark.
Lasse by Yteta January 18, 2017
Such a Lasse
Lasse by _Kater_ January 9, 2018