Real Stiff Penis 

1. An endearing term for someone who is just a real big dick. One who is an all around cock.

2. What girls or guys like spending upon orientation. A real hard cock.

My boss is a real stiff penis. What a jerk off.

Rachel is a whore. She’s always down for a real stiff penis.

Real Stiff Penis by Eaton Holgoode October 17, 2018

school girls stiff 

is a school girls masterbation tool wich she uses during school under her skirt wich can be such as a pen, pencile, or retractable eraser.

i use mi school girls stiff during class all the time

school girls stiff by asia July 13, 2004

Bored stiff 

When a guy is so bored he starts talking to girls to fuck.

Jeff "Fuck dude i'm bored stiff!"
Amy"Awh yeah wanna come over?"

*Jeff goes to Amy's house and uses his stiffy on her*

Bored stiff by whambamthankyoumam.. March 13, 2011

as stiff as an old man on a cold winter's night

a common phrase used when describing an extremely rigid erection.

"wow, my girlfriend gave me a joyner last night and i was as stiff as an old man on a cold winter's night"

as stiff as an old man on a cold winter's night by Nick Meyer. April 1, 2008

going stiff

Something like the poop shuffle, going stiff is a tightening of all muscles in body to keep the shit held in your arse until you have reached the toilet, you can easily identify when someone is going stiff as they look like they are waddling very quickly while walking.

Hey Greg, what's wrong? Going stiff are you?

going stiff by Kristina Green April 25, 2008

Run-stiff 

used to describe someone who is keen as/desperate or horny for sex so much they look like a naked man running with a hard on.

Also used to describe how much you want/wanted to have sex with a girl

haha you were so run-stiff over that girl on friday night you couldn't take your eyes off her!

yeah bro when I saw that bitch shaking dat ass she made me sooo run-stiff I just wanted to fuck her right then

dude I saw you talking to that girl it was so obvious you were running stiff for her

shit I'm feelin' run-stiff tonight bro lets go get some pussy!

Run-stiff by yo bama February 10, 2010

negative stiff 

when the guys wood is anything but stiff..trying to perform with a lipm dick

Bobby wanted to show jenny how good he was in the sack , but when he tried to give her a hard wood, it was a negative stiff...

negative stiff by lady D82 March 30, 2009