One-word response placed after a quote on a message board as an affirmation of the author's agreement with the quoted person's view or opinion. Commonly used on Fark.com.
Some guy: "Nice to see that the human race has advanced to the point of using robots to poke things with a stick."

Another guy (after quoting above): This.
by J. Harvey September 17, 2007
A superficially clever way to agree with a statement made on an internet forum. Reads and sounds somewhat silly since the correct word for pointing to someone else's post would be "that". "This" would be the word you would use to point to your own post.
Forum poster #1: "The schedule TV model is dying. If you don't give me on on demand viewing option then piracy will always be something I will consider"

Forum poster #2: "This." ...

Forum poster #3: "This what?" "Oh you meant THAT. Ha ha, I get it, very funny"
by Bill Murray of the East June 2, 2012
An object, person, place, or thing that is being mentioned.
"This new rickroll is really great!"
by FortNiglet69 November 22, 2020
A word used to give complete agreement to, often used on Tumblr to 100% agree with a caption on a picture.
*photo*

Caption: If you're gonna be two-faced at least make one pretty

^this.
by Tina Peach December 31, 2011
What sweet dreams are made of
Guy: hey siri what are sweet dreams made of?
Siri: this
Guy: who am I to disagree
by Urbanpen15arry December 31, 2021
This
Byleth: This.
Manana: So, This.
Sothis: Yes?