Slack Bitch 

Someone who is so lazy they would rather complain for months about flash player not working than actually click one link and install it, so they can watch a monkey piss in it's own mouth on youtube.

Lee: OMG i just found a monkey pissing in his own mouth on youtube check this out *sends link*

Mary: I can't because I don't have flash player installed. It hasn't worked for months

Lee: Oh you fucking slack bitch...

Slack Bitch by lhm October 6, 2008

Slack crack 

slackness of woman genitalia

fuckin ell lass u gotta slack crack

Slack crack by gavin lawson May 7, 2003

slack as a yak

Extremely lazy. Could also be used to describe someone who is a very slow worker.

He hasn't finished that job yet - he is as slack as a yak

slack as a yak by Terence Jacobson November 14, 2007

slack course 

A course (usually academic) where a high/moderate grade is easily obtainable without much effort placed in studying, class attendance, assignments, or care. In it's extremity, a slack course do not require the previously mentioned.

Slack courses are usually used by students who wish to improve their academic averages, earn easy credits, do other assignments/studying whilst in a classroom environment, sleep mid-day, stay at home.

You should take Human Relations 101, it's a slack course where all you have to do is talk members of the opposite sex.

I took a slack course right after lunch so I can get of sleep before Organic Chemistry.

Modern Musicians is the slackest class ever, you write about Lady Gaga and get an A.

slack course by The hardest button to button February 5, 2010

slack son 

when the homie doesnt come through and you were hoping he did or would

the homie jv: "hey man i didnt bring that kush you wanted"
me: "slack son"

slack son by thatnativekid April 10, 2015

slack serpent 

Euphemism for a well dressed, well hung, gentleman's genitalia

"That dapper man, gets all of the ladies due to the bulge his slack serpent creates"

slack serpent by Shoein machine sheen March 6, 2017

Slack-Mosh 

noun
: a low-key or sedate mosh pit, such as at a Stoner Metal concert

intransitive verb
: to engage in a low-key mosh pit

Did you see the slack-mosh at the Sleep show? Everyone was so polite, and there were more than a few people smoking weed and oil pens.

Slack-Mosh by Stoner Metal July 26, 2017