What do people mean when they insert a quote by someone's post and say "This."?

[Smeeble]

(Some quote here)
Person: This.

[Ad Bot]

[Pliny]

The person agrees with or would otherwise have said what's in the quote.

[sir dooble]

It means that they believe the person they quoted is right.
Instead of saying the exact same thing, you quote the person who said it and say 'this'.
That tells people that the quote is the same thing you would've said.

The person agrees with or would otherwise have said what's in the quote.

This.

[Smeeble]

It means that they believe the person they quoted is right.
Instead of saying the exact same thing, you quote the person who said it and say 'this'.
That tells people that the quote is the same thing you would've said.
This.

This. :D

[e-maxx]

C-C-C combo breaker

[Smeeble]

NO, YOU. GOOD DAY TO YOU, SIR.

[No, FROHman Elite!]

This. :D

Not really a 'This' moment.

[Zenthrox]

Not really a 'This' moment.

 

This.

[Devvy]

This.

Doctor, I think i'm a homoloveual. How can you tell?

RAINBOWS!

[e-maxx]

C-C-C combo breaker