What is Do Not Click This Unless You Are 18?
1.
Reverse psychology to get people under 18 to click on something.
"Do not click this unless you are 18"
...
*Clicks 900 fucking times*
*Porn comes up*
*Clicks 9000 fucking times*
See
2.
A technique that tempts you to click it and you get god-knows-what popups after you click it
*A hand with longer black finger nails points at text* Do not Click this Unless you are 18.
See