Someone who gets a girl pregnant. (ie. Butter is slippery, nut is cum, they slip up and don't pull out, making them a Butternut.)
"I found out my girlfriend is pregnant..." Said the son, worried.
"Wow! nice going BUTTERNUTS." Shouted his mother, angrily.
"Wow! nice going BUTTERNUTS." Shouted his mother, angrily.
by hannuhhshp March 18, 2020
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Get the Butternutmug.