Top Definition
When a male stuffs his erected penis and balls tightly between his thighs and has another person stare directly at both the penis and balls. It isn't considered a Rocket Booster until the Rocket Boostee' formally announces, "HEY, IT'S A ROCKET BOOSTER!"
Brett creeped up behind Ugly Bake and T-Wabes and announces ITS A ROCKET BOOSTER before getting bag-tagged
by WABEZ January 05, 2009

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