Re: Such a slang?
(1) Cut the dude some slack.
Does the "slack" mean "unused capacity"?
What is "cut"?
"Cut the dude some slack" would be the same as saying "Give the guy a break". Both are basically just saying to stop being so picky and leave the person alone.
(2) You deserve to be mushroom stamped for your comment.
What does the "mushroom" mean?
I've never heard this one so I'll leave it alone. Maybe someone else has heard it.
(3) If you want conspiracies, try the JFK one.
What is JFK?
"JFK" refers to John F. Kennedy, former US President who was killed in Dallas, TX. There are several dozen conspiracy theories about his death (i.e. who was involved, how many gunman there were, etc..).