This is a metanode for contemporary Japanese slang for when you and your shiftless friends are wasting time together.

• For Greeting Your Shiftless Friends
• For Hanging Around With Your Shiftless Friends
• For When Something Happens And You And Your Shiftless Friends Are Nonplussed
• For When You And Your Shiftless Friends Are Temporarily Amused
• For When You And Your Shiftless Friends Are Confused Again
• For When You And Your Shiftless Friends Get Something To Eat
• For When You And Your Shiftless Friends Go Shopping
• For When You And Your Shiftless Friends Are Thinking About Seeing A Movie
• For When You And Your Shiftless Friends Are Wasting Your Time On Chat

If you like this stuff, you might want to go to Japanese Ranting Slang.

Or perhaps you might like to go to the Ranting in Various Languages metanode?

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Starrynight, most of this came from my niece who lives in Tokyo. I can never understand anything she says. Heh.

For what it's worth, most of the phrases sensei delineates here are less "slang" and more casual speech. Also, they assume a Tokyo dialect (which to be fair, is replacing more and more the regional styles of speech).