The worst or most boring version of something; something that is weak, unconvincing, or disappointing (superlative of 'lame').
From Old English 'lam' meaning unable to walk properly, combined with the superlative suffix '-est.' The slang meaning of 'boring' or 'uncool' developed in 1950s American youth culture.
The slang use of 'lame' to mean 'uncool' is considered offensive now, but it originally came from jazz musicians in the 1940s-50s using 'lame' to describe people who didn't understand the culture—creating an accidental disability slur in the process.
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