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Similar to a tickle but a much more aggressive action. An Armpit Rocket is when one protrudes two of their fingers, (the pointer finger and the middle finger), into your armpit and wiggles them forcefully. WARNING: This action causes much pain and loss of breath.
Stephanie is stretching with her armpits fully exposed.

Chelsey: "Dude you're so vulnerable for an Armpit Rocket right now, it's unreal."
by Chelsey Gibbons January 22, 2011
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