Indicates publicly that you give something your stamp of approval. It is a way of telling your friends, coworkers, etc that you feel it would be worth their time to take a look at something. You share because you care. Stems from Google's rating system.
my friend: Do you know (Insert Name)
me: +1!
my friend: Hell yeah, me too!
by JGuy The Great! July 15, 2011
In math class, when writing -1 and then realizing the answer is positive 1 so you draw a line through the minus sign and it looks like you are retarded.
teacher: So as you can see the answer becomes -1...
*students write -1*
teacher: ...but since it's a negative times a negative it becomes a positive 1.
*student make their -1 a +1*
by blaah43 December 15, 2008
Adding (usually) invisible points to someone's hilarity score. Usually when a sarcastic, but hilarious, comment is posted.
Poster 1: "in related news, the homeless guy that hangs out down the street from my office just announced children are in danger from bugs that will crawl in their ears and "infect them with the debbil.""

Poster 2: "+1!"
by The Man Under The Chair January 14, 2009
+1 is the least-disguised form of spam known to man. Some better disguised spams are threads such as 'What are you listening to? and 2, 3, amd 4 letter word threads.

In moderation it can be funny but be warned: Excessivew use on your forum/s can result in your post-count being cut, or a tempory (or even permanant) ban put in place. +1 should only be used once or twice on any one forum as it is only funny for so long.
guy1: I have a Q ect ect (posted at 1:00)
guy2: here's your A. blah blah(Posted at 1:12)
spamguy: +1.(Posted at 1:13)
(Thread is locked with +1 still visible ot the world. People snicker briefly at the forum whore).
by Bazza|insertanumber December 22, 2005
A term used by D&D role-playing geeks to indicate that something is better than the standard variant. It often bleeds into online chat and forum posts.
1. OMG this Nokia 6800 is so cool, it's like a +1 Cell phone or someothing.

2. I came so fast, that must be a +1 dildo
by Mystech September 25, 2004
+1 is used on forums by spammers who want to raise their postcount by 1.
d00d posts: +1
by Stiffer August 08, 2003
the '+1' term was first used in the slashdot news community, to simulate moderation of a user-submitted comment.
mod it +1 interesting
by rsqdfsd September 05, 2007

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