Someone who obviously isn't as tough as nails. Someone who is known to have greened out is often refered to as.. soft, pussy, or faggot. People often create Twitter hashtags or chirp the living shit out of the one toke pussies who consider themselves to be as "tough as nails"
Randy: "Hey Daryl! I just packed a huge bowl, Wanna toke?"
Daryl: "Yeah man! (Takes a toke)"
Randy: "Hey Daryl you ain't looking to good. I though you said that you only had one toke?"
Daryl: "I did only have one toke.. oh shit.. (Pukes)"
Randy: "Dude you greenout after one toke! Your as soft as puppy shit!"