Actually his Avatar implies either he:
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cannot spell, or
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because the “your” is a second person personal pronoun that by definition relates an object to the possessor and in reading the declatory statement, the only subject would be him as the “I” - he is relating himself to the reader (the possessor). Stupid in the sentence is the adjective being used to describe the subject (the sentence has only one subject the “I”).
Therefore the statement reads: “I am a nerd but I am stupid and belong to you”
