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The act of smacking your girlfriend, and/or violently laying the smackdown on her stupid mouth.
Girlfriend: "Hey, your an idiot with a stupid mouth!"

James/boyfriend "Say that again and I'll lay the smackjack on yo ass!!!"
Smackjack by Russ Diesel October 27, 2011

Stackpack 

A pound of marijuana or other enticing substances for 1000$.
Damn that stackpack was straight mids.
Stackpack by HighLyfeStyle November 7, 2018

Slackback 

A slackback is referring to a day when you are slacking off from dialing and selling. It can also mean a day that you did not post any new sales on Slack.
Becky "I just got a chargeback."
Mandy "Girl, I hear you, but you have seen your slackbacks? Get rid of those days and the chargeback will disappear."
Slackback by Insurance Guru November 9, 2022

Sharkjacking 

An extreme sport of which the object is to masturbate a shark, the greatest achievement possible being an ejaculation by a Great White Shark. One participant ties raw meat onto his/her ankles and swims near the shore to lure in the animal where three others wait. When the shark approaches, the three sleepers wrestle the shark into submission and the "baiter" manually stimulates the shark. Upon ejaculation it is important that the team clears the area as quickly as possible because post-orgasm behavior of sharks is often erratic and the chance of participant injury is increased due to close proximity.

This sport can be played by a team of more than four, but traditional Sharkjacking is done with a team of four.
"Nothing like a game of Sharkjacking in the morning to get the blood flowing, eh boys?" --Chris Kahn of the Starship Enterprise
Sharkjacking by QuadkilleR June 23, 2006
To hit someone in the balls with the back of your hand generating power from a backswing of the stronger arm and finishing with a graceful flick of the wrist...
- From the Ancient Roman word 'sackuswakus' - meaning 'ruptured ballsack'
"you only get a sackwack if no one likes you"
sackwack by Unknown-Infinity August 25, 2006
A very lazy person
Slackjack by mac_munch November 14, 2003