Someone who has fucked everyone’s mother including there own and the ones related to that individual.
“The mother fucker is the goat”
by RapaTuMadreLLC September 13, 2021

Any asshole who you don't want fucking any of your female relatives, such as you mother, sister, brother, pets, steps, uncle, aunt, cousins, nephew, niece, friends, the local barber, the gas station attendant, your investment banker, the ATM at your bank, etc. etc.
My cousin Boo Boo from North Dakota told me that she was so upset that after her father "boinked" her mom, he came after her, and then she went after him with a baseball bat. "What a mother fucker!" she said, and something else I can't say.
by exurbanwhitetrash May 26, 2022

Typically a co-worker with no innovation while carrying out their tasks. Someone happy with the status quo with no thoughts about how to improve.
"How was Greg's presentation?"
"How do you think? That ho hum mother fucker hasn't changed it in years!"
"How do you think? That ho hum mother fucker hasn't changed it in years!"
by Justanobody714 January 18, 2017
