Needless explosions causing loss of woman/children and or irreplaceable artifacts
"Generic military rank is celebrating the capture of whatever city in small warring country by coalition forces done with minimal collateral damage"
by Pheidippides December 26, 2003
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When you extend an invite to a group of people in a room and there are people there you don't want to invite, but have to because it's the polite thing to do.
A: what the hell is he/she doing here?

B: collateral invite.

A: oh. i'm sorry.
by urbanwordsmith September 11, 2010
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When one searches for answers regarding a specific subject, but ends up learning about several others in the process.
Yeah, I was just trying to find out how to pronounce "Boise", but ended up also learning about the molecular structure of a diamond lattice. Talk about collateral knowledge...
by McHammerface October 15, 2011
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When one intentionally farts on another person intending on only harming them, but other people in the room suffer from the foul flatulence.
gassy friend: Hey Mark! Take this!
(farts on Mark)
Mark: eeeew!
John: oh no! Collateral damage!
by Mandalore96 November 5, 2010
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"Borrowing" someones possesions at a sleepover or get-together and then keeping the item for a long period of time in hopes to remain friends with the group the item was "borrowed" from.
Jake is holding Henry's Zelda: Twighlight Princess for randsom in hopes to remain friends with the group, talk about friend collateral.
by Robert Segrin December 12, 2007
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The act of passing on an std twice in one night
i caused some serious collateral damage at the bar last night
by the friendly farmer November 27, 2010
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"Borrowing" a persons possession during a get together or sleepover, and then holding it randsom so they still remain friends with said "borrower".
Henry: "Hey Jake could I have my Zelda:Twilight Princess back, I think I left it at your house last week".
Jake: "Sure, I'll bring it in tommorow"
3 weeks later......
Henry: "Hey thanks,Mike, for selling me your Zelda:Twilight Princess for 20 bucks".
Jake: "Wait, you wanted that back? Why didn't you ask"?
Henry: "..............damn friend collateral"
by Robdar102 December 6, 2007
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