+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
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Those extra TV channels that show programmes an hour later.
"Oh no! I missed Smallville on E4!"
"Watch it on E4 +1 then!"
by Mister Ignorant April 30, 2004
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When someone accepts a person's friend invitation on facebook regardless if he/she even knows or likes the person, mainly accepting the invitation so it makes his/her friends list bigger.

+1 refers to the fact that it adds 1 more person to their friends list.
Guy 1 - Dude, Steve has so many friends on facebook! How is he so popular?!
Guy 2 - Most of them are +1s, out of the 300 friends he has he probably only knows 80 of them.

Or

Guy - "(insert name here) wants to add me? I don't really like him but what the hell +1 I suppose."
by hardaslada August 18, 2011
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the '+1' term was first used in the slashdot news community, to simulate moderation of a user-submitted comment.
by rsqdfsd September 5, 2007
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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 16, 2011
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When you copy and paste "!1!1!1!1!1!1!1!1!1!1" and go too far.
Person 1: SO FUNNY!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1

Person 2: Did this guy get crazy with the paste button?
by coolmathgames.com January 1, 2018
Get the !1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1 mug.