Doublet Five 

When someone says they need "just five minutes", but end up keep you waiting for an hour... every time.

Doublet: Hold on guys, I'll be there in five minutes!
Everyone: Sure you will!
Everyone (whispers): Sounds like a Doublet Five...

Doublet Five by MHFox May 21, 2008

Double five 

A high five with two hands, also known as a high ten.

"You scored with those twins? Double five!"

Double five by Thomas Christian January 15, 2009

double high-five 

When you go for a traditional two handed high-five and once the opposite party's hands are high in the air, you punch 'em right in the zipper.
Coined by Johnny Knoxville on Conan.

"Don't go trusting ol' Jim over there, he'll trick you into a double high-five."

double high-five by Gabe_Babe November 1, 2013