Noun: Two/ or more chicks, jumping in the air excitedly and performing a high five with their chests.
Note - They must incorporate loud obnoxious cheerleader hoorays as they complete this action.
Kyle: "Omg dude, those chicks totally did a high-boob!"
John: "Man...them chicks are fine!"
(Stella and Lily win a tennis match together)
Stella: I can't believe we won!
Lily: Me neither! High-Boob!