The word ma'am is a contraction of madam which is typically used as a polite form of address for a female. There are no categorical antonyms for this word. However, one could loosely use insulting forms of address for a female as antonyms, e.g., bitch, harpy, shrew, etc.
Noun
A respectful term of address to any male, especially if his name or proper title is unknown
“Thank you, sir. Allow me to show you to your seat.”
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