Leaving your irc client connected to a server and sitting in channels even if you are not at the computer. This allows a group of users to stay in contact even if they are not active all the time.
Many misunderstand this concept and think idling means to stare at an inactive channel for hours on end but it just means leaving your client connected even if you aren't there or are doing other things.
Note: things like the following would not be possible if both users were not idling.
9:56am <user1> so user2 how are the girls?
1:12pm <user2> they are doing great! i just got home.
1:12pm <user1> thats good. tell them hi for me :)
When a woman arouses a male just enough to create a small amount of semen that drips out of the tip of the penis, getting the male ready for some head in the bed.
Her: Does this turn you on?
Him: Oh yeah, keep whispering those words. You're really inking my pin.
When in a meeting involving 3 or more parties, when one party is deliberately causing confusion, usually in order to advance their own agenda or to hide their own incompetence.
Mortimer doesn't really know what is going on, but he does not want his boss to know that, so he is squid-inking the whole meeting