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4.
+1
A statement that shows the writer's approval of an aforementioned idea, phrase or concept.

Similar to 'like'-ing on facebook.
John - "Wow, that was the most amazing movie ever!"
Adam - "+1 to that, man"
by Korsyn01 March 21, 2011
 
1.
+1
1.) A post in a forum/message board that indicates the person agrees with a previous or quoted reply to a thread.

2.) Shorthand for "My thoughts exactly" or "me too".
Joe posts: "Urbandictionary.com is a great site for learning forum speak."

Floe responds: "+1"
by Joe Mama April 28, 2004
 
2.
+1
Used by forum posters when a person agrees with a point. Sometimes used incorrectly when referring to one's postcount going up.
Urbandictionary is a useful website

+1
by JiTek May 19, 2008
 
3.
+1
Your Significant Other, Date, Wife, Hetero-Life-Mate, etc.

The person that goes along with you to events, or just accompanies you through something like a night out or the rest of your life.

From invitations and guest lists, ie. Gary Applebottom +1.
"i don't have a +1 for tonight..."
"sorry, couples only - put an ad on craigslist"

by pcka February 25, 2009
 
5.
+1
A common internet slang term used on networking websites, forums, and chat rooms, a "kudos" of sorts when someone says something clever.
"If Tom was a space pilot, would you trust him/her to take you to the moon?"

''I'm surprised he's not already a pilot. He's got the drinking part down.''

+1
by StoneTheWeak November 08, 2009
 
6.
+1
Term in the music industry for the friend or date of someone on the guest list for a show.
Howard was on the guest list for the Po' Girl show. I was his +1.
by deb April 30, 2004
 
7.
+1
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