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A portmanteau of the Hawaiian-style "bro" (brah) and Transformers protagonist Optimus Prime. A Brahptimus Prime is a person with noble/selfless goals and zero drive to realize them.
"Did you help out at the homeless shelter on Tuesday?"

"I was going to but instead I slept in."

"Pulled a Brahptimus Prime?"

"Yeah, brah."
by bloomintemp8 October 12, 2011
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