Does the word "numb" is a slang? Can I use it on formal occasions?
"Numb" is not slang. It's an adjective used to describe the physical state of being unable to move or feel anything in a certain part of your body, usually due to cold weather or anesthesia. In this case, the rapper is metaphorically stating that his lover is like a drug, and he wants to breathe her in (like when consuming drugs) until he feels numb (cannot feel anything). Ex: It's so cold outside that my face is numb. Ex: When she saw the robber coming towards her, she became numb with fear.
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