The word is spelled "metaphor". The expression seems quite literal to me. It's just like "my breath reeking of onions".
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Anonymousis it a metaphor?Not if your clothes smell like corpses. In that case you are just using 'death' to mean 'corpses', i.e., dead people, so there is very little that can be considered a figure of speech (a non-literal use of words) here.