boner-flex 

Sometimes spelled bonerflex. A boner-flex is when one is in a public place or something and he is horny and has a boner. However, not wanting to embarrass himself by masturbating, he flexing his penal muscles to acquire the intended pleasure.

The word boner-flex can also be used as a substitute for various swear words.

Dude, I was so horny in class so I just had a great boner-flex.

Dude, what the boner-flex?!

Son of a boner-flex!

boner-flex by Smittalicious October 21, 2014

flex boner 

When a dick is not hard but its not soft. It is basically a boner that you can flex.

Usually you get a flex boner when drunk.

Can also be referred to as a flex-b.

I was so tanked last night, I couldn't even have sex because all I had was a flex boner.

flex boner by Zach2k8 March 12, 2008

Shy Master Flex T-Bone 3000 

Someone who is very cheap with their money whenever they go out clubbing. Can also say just, "Shy Master".

"Luigi you fucker, I'm not giving you another cigarette you fucking Shy Master Flex T-Bone 3000!"

Shy Master Flex T-Bone 3000 by DJ Bless One November 23, 2006

bonerplex

Unzipping just your fly and letting your junk ( balls and shaft ) out to lay on your lap while viewing a feature presentation in the theater.

I totally pulled off a bonerplex last night during transformers 3

bonerplex by Ereonte Pitts July 21, 2011