To 'Touch the Sun' is to get so high on an intoxicant/s that you feel like you can touch the sun.
Sam: Man, lets take all the shit we have and touch the sun!
Phill: Fuck yeah, I want to burn my hands off!
UMMMM... WTF WHY'D YOU SEARCH THIS???!!! (it means clapping someone in their balls or cheeks)
imma touch you where the sun dont shine lil bro
nah but seriously, stop it. get some help. you're weird for searching this.