When a male ejaculates so vigorously you can count the number of seconds the cum stays in the air before hitting a surface giving it the appearance of a rocket.
by Helmbros June 03, 2014
Marsha: Hey Julia, John has a rocket penis and I don't know how to tell him I don't like it. I mean he can spooge like a champion but his throbbing man sword is just a measly rocket.
by King Nugget February 21, 2017
A penis that is pointy like a shiv, shaped like a rocket and delivered with military precision in a prison style blitz attack on your private parts. A moderately disturbing succession of short shallow jabs to your lady bits.
He stuck me with his pointy rocket penis as if perpetrating a gang style prison hit with a hand carved tool designed for minimal penetration and pleasure.
by Lady Rock 'n Roll January 01, 2017