1.To lose control or freak out.
2.To act crazy
I told Antron we had to take the bus home, man he went fuckin butt nerd.

...and then a helicopter shot at the hulk and the hulk went fuckin butt nerd smashing stuff
by Antron January 1, 2005
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When the calibre of nerdy is matched by the size of butt, commonly seen in cargo pants. Often easily identifies a nerd by the size of butt in higher worn pants.
Wow, Sean has a big nerd butt going on!
by scotupper January 16, 2012
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A man or woman's butt that has become so flat from multiple hours of sitting at a computer, it assumes the shape of a pancake.
"Damn son look at that nerd butt, what do they do to get that?"
"They work in IT"
by TheKrispyDog May 10, 2021
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