When a person has a boner that looks like and or feels like a erection that is strong and or going to burst. One could even use said erection to poke many things.
Jim: Hey man how did you and sarah work out last night.
Bob:dude I got a "Rocket Fist" and she saw. She couldn't stop looking.
Bob:dude I got a "Rocket Fist" and she saw. She couldn't stop looking.
by Some FN Guy December 26, 2009
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