1. An enthusiastic expression of affirmation, such as "hell yes!" or "fuck yeah!"
2. To draw an equidistant perimeter around a center or point of reference.
"Shall we order a bottle of Ciroq for the table?"
"Circle that!"
"Hey, I"m hungry, I think I'm gonna make some nachos. You want some?
"Circle that!"
"I love you. Will you marry me?"
"Circle that!"