you stupid fucks it means getting so wrecked on weed you cant stand up and you puke all over your bird, usually accompanied with 'out' so this would make 'green out'
often used in the phrase "go green!" which is all the rageright now. which is cool, but all the hippies and eco friendly people are pretty psycho about it.
origionally an online based word, similar to 'own' and 'pwn'. This was created due to a character named "Marvt74" being very ignorant, as his text colour was green, and it was hard to read on text only displays in hte 80s. Green is therefore used to represent someone who is dumb and doesn't think about things before saying or posting.