4
a person who only has sexual relations with women that have birthed offspring.
wait, didn't she just have a kid like a month ago? you mother f'er...
by Benny March 29, 2004
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5
One who has sex with their wife/girlfriend after the said party has already had at least one child.
After having sex with my wife last night, I am now a mother f'er.
by Dave March 30, 2004
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