jackflap 

you know that thing that sticks out between a man's legs? that

Jeff's jackflap is huge

jackflap by Johnny Clarkey July 30, 2007

Jackflip

verb: To perform a backflip while masturbating

OR

noun: A backflip performed while masturbating.

Harrison: OMG Jamie just double jackflipped!!

Astonished Onlooker: WOW! That's two jackflips in a row! Jamie's hella cool!

Jackflip by hbhbhbhbhbhb November 9, 2011

Jackslap 

a common term used by military firefighters, meaning to "dust of the bitch slap" or to "Slap you with the back of one's hand". This is commonly used from one soldier to another if someone says or does something stupid, pushes just the right buttons, or irritates another soldier.

"Soldier, I will jackslap the cowboy piss out of you if I don't get my goddamn newspaper back!"

Jackslap by Bryan H. September 13, 2006

jackslap 

v. - a severe and often extremely painful beating. Thus usually used only for intimidation purposes

ie.. "if you don't stop that shit I'm gonna jackslap you like a monkey"

jackslap by Zman July 18, 2004

jackslapped

When you get jackslapped by a pimp.

Quin jackslapped Tra for being stupid.

jackslapped by Quin and Tra March 29, 2008

Jackslap 

The act of shoving your index and middle fingers into another persons nostrils, pulling upwards while using your other hand to smack the stretched out nose.

She dumped me after I jackslapped her.

Jackslap by C&M112509 December 2, 2010

Jackslap 

The act of someone hitting another person in the face with a tire iron.

Person 1: Dude? Why the hell did you jackslap me?

Person 2: You pissed me off!

Jackslap by Pillowpants9 October 21, 2010