When sleeping next to your partner and you line up your butthole directly with a partner’s hole and fart. Their reaction let’s you know if the rehearsal was a success and you’re ready to move on to space docking.
I woke up my wife by lining up my butthole to her butthole to perform a NASA Dress Rehearsal before the space docking later in the month. She screamed that she felt the fart deep in her butt. I knew then, my years of preparation made me ready for the Space Dock. T-minus 20 days…
by Ice Meow September 24, 2022

The time when you put on a suit / dress to make sure it fits before the big event. You leave the tags in so that you can return items that do not fit.
by Sept. 7 April 22, 2009

The old dick you have to get, before you get all the new dick, because it's been a while since you had dick, so you have to reacquaint yourself with the ways of dick.
"We're definitely gonna have sex soon...I'm nervous though, I haven't had sex in aaaaaaages"
"You need to get yourself some rehearsal dick first, reacquaint yourself. Get the old little black book out."
"You need to get yourself some rehearsal dick first, reacquaint yourself. Get the old little black book out."
by That_Bev December 8, 2017
