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Someone really pathetic. They want to be l33t but even l33t losers consider them to be a loser. The most pathetic form of life.
Get out l0s3r before we h4x0r your c0mp00ter.
by w00tw00t April 05, 2003
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Another way to say loser, and also give someone a seizure

L0S3R can also be indeering, and mean a lovable precious nerd who should be protected and shielded from the cruel reality of life.
Nick such an adorable L0S3R
by Pastiiles March 04, 2019
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