This is when a man has missionary sex with a woman (who doesn't shave) and pulls out then ejaculates on her bush then performs oral sex on her. The inference is that her bush is kinda like a "birds nest".
Lisa: That dude seemed alright but he got drunk, did the woodstock, then tried to kiss me. Not cool.
A Woodstock Dick is when you look like you attend the woodstock festival and you take a lot of speedy drugs and you have a huge bush of public hair. Your clothes become a burden so you get naked and walk around with your mushroom cap sticking out of the bushes as seen at the woodstock festival I'm archival photos.
Random hippy chick: Hey peace man you're really groovy . It takes a lot of guts to be naked in public when you have a Woodstock Dick
dirty, stinky, indie chick that (1)wears all natural clothes and perfume, (2)sleeps with every member of the band, (3)is "too cool" to work, but constantly complains about not having money (refuses to be "corporate slave"), (4) holds useless liberal arts degree(s); most likely encountered at open-air music festival, occupy xyz protest, posh cafés, abstract art museums, parks, wherever there is free food/drinks provided
This woodstock skank hasn't showered in three weeks.