a semi-erect penis

suggestive of a penis which has partially lost turgidity after cuming
That hole looks a bit small but maybe I could thumb in a slacky
by Christianaj April 11, 2007
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A semi-erect penis.
More specifically a semi-erect, post-ejaculation penis.
That hole looks a bit small, maybe I could thumb in a slacky.
by Christianaj April 10, 2007
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Co-worker who wanders the hallway throughout the day, stopping by to interrupt others from their jobs. Oftentimes, the office slackie will strike-up conversations about ambiguous things, typically with no point (see time whore). Also known for walking up on conversations that are in progress, and will proceed to insert himself into the dialogue.

Not to be confused with a door bore, who mainly strikes in the morning.
Hi honey, what did you do at the office today?”

“Today, I created a spreadsheet to track the number of times John came into my office to talk about nothing. Twelve times today, he such an office slackie.”
by Line Drive May 2, 2007
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A Insult to use against people who love cum or are just being an asshole
"Fuck you Bryce, you cum slackie"
"Hey man that kind of hurt my feelings"
"Shut up cum slackie"
by JoeDickButt November 25, 2018
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A pair of old, warn-in and often dirty sweatpants. Q-tip known for wearing them to the airport for a 24 hour flight to Sydney form London
Robbo sat in his slacky dacks all day, after a big night out on the tins. Safe to say they were still being worn whilst having multiple masty's throughout the day - average room temperatures rise by apprx 5c when he walks into a room wearing them.
by Backing in Burma November 20, 2014
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The laziest employee in the casino business, whose daily activities at the casino consists of making dealers work for more than 1.5 hrs per break, writing dealers up for not coloring guests up to the next highest color, and typing vague descriptions in or none at all for guests, often severely underestimating players’ average bets. Credited for the term “it’s all in the notes” used when it is his turn to go on break/go home so that he doesn’t have to spend an extra minute to let his replacement know what is going on his section.
Example 1)
Supervisor: “Hey, it’s your turn to go on break. Anything important I should know abou...”
Slacki Lacki: “It’s all in the notes!”

Example 2)
Dealer on break: Wtf! they let me in for 2 hours!”
Other person on break: “Who was the pit?”
Dealer on break: “Slacki Lacki!”

Example 3)
Dealer: “I just got written up for coloring $500 worth of green into a purple.”
Other Dealer: “So what’s wrong with that? And who wrote you up?”
Dealer: “Slacki lacki said we have to color up our players to the next higher color.”
by SlackiLacki April 12, 2020
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That annoying and extremely visible, but absolutely useless stage of semi-erection suffered by teen males when observing a pretty girl, riding a bus, doing something completely innocent - and it JUST HAPPENS !
All the guys laughed when Josh got a "slacky wide on" as Mrs Thermapopolis the 48 yr old Greek language teacher bent over to pick up the text-book she had dropped.
by RecByjam July 9, 2005
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