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The motion your eyes get when you look at a thick, bouncing woman's ass while walking behind her, or when this same instance occurs with boobs from the front (ex females jogging)
Example 1
Guy 1: "Dude, I got a problem..."
Guy 2: "What?"
Guy 1: "I get bouncing eyes when walking with my girlfriend, I get it real bad..."
Guy 2: "Well just stare at your girlfriend until the nice meat in front of you goes away."
Guy 1: "Thanks man, I'll try that."

Example 2
*walking with friend*
Guy 1: "Joe put away those bouncin' eyes you look like your on a damn pogo stick!"
by _Gnasher_ April 08, 2013