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."
Someone considered extremely attractive/cool at some point a long time ago, but not anymore-reminiscent of long-forgotten players who no longer hold much sexual prowess.
"Wow, Lee is looking rough these days!"
"I know-he's horse-and-buggy hot, hard to believe so many girls used to chase him-he couldn't pay them too now"