roadie finger 

When the tip of ones finger becomes covered in ash after using it to pack down a bowl of weed after it has been lit while on a roadie. (smoking whilst driving)

I've got mad roadie finger bro

roadie finger by Roadie kids September 23, 2016

roadie finger 

When your finger tip is covered in resin from smoking while driving

I got hella roadie finger

roadie finger by Roadie kids August 27, 2016