2 definitions by RanDominoX

Top Definition
In an exact manner; precisely correct; accurately
Person 1, "I don't get it."
Person 2, "See the difference between the two signs?"
Person 1, "One is bigger than the other?"
Person 2, "Exactapacally."
by RanDominoX March 12, 2011
The moment when a female's bra straps form into the face and or head of the famous Autobot from the Transformers franchise, Optimus Prime when she wears a tight shirt.
Guy: "Dude, did you see her Optimus Prime?"
Dude: "Yeah, it was bulging out, everyone saw it."
Guy: "Do you ever think she'll know everyone was laughing at it?"
Dude: "No, girls never really know when they have an Optimus Prime."
by RanDominoX April 14, 2011

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