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1.
When something will inevitably go wrong to or for you. To fail.
Ben dropped his phone in the toilet, thus he got Larsened.

I larsened myself for sleeping with that fat girl.
by kalel44 November 13, 2011
 
2.
A male passing out pre-7pm and getting balls and/or sausage in the general face vicinity.
Dude, Eric passed out cold during the Oscars last night and got totally Larsened.
by SloppySeconds2011 March 02, 2011