Top Definition
A person that wants to hit every sexy lady in the world. That means a pervert.
"OMG you are a Lasse!"

"Stop being such a Lasse"
by iam2hot4u May 21, 2009
Lasse is the definition of a really nice guy who is so awesome that if you`d count to his awesomeness, you would never get finished. Lasse is also a word for an extremely smart guy. (His IQ is over 9000)
Wow that guy is so Lasse. I wish that i could be just as Lasse as him.
by Flyin_Pig_of_Joy November 11, 2014
A guy so otherworldly intelligent, that people around him think he's a nobody, but in his head he has the secrets of the universe.
You see that guy over there? I bet he's a Lasse.
by Cr3nzer June 20, 2015

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