she could think you smell, or she may be trying to smell drugs on you. she may just be or goofing off. the way to know for sure is just ask her. if you are close enough she will give an honest answer.
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If a girl smells you or your clothes, it could mean that she is trying to get familiar with your scent, which is a common behavior in animals and humans to connect with others. It could also indicate that she finds your scent pleasing or interesting.