To get high, most commonly by means of marijuana. Trees is a common slang name for marijuana. When you climb a tree, you're getting higher in elevation than when you were on the ground. Therefore climbing trees refers to getting high off of trees.
Hey I just got an eighth of some haze, want to go climbing trees?
When a person focuses too much on small detail (trees), and misses the big picture (forest).
Stressed out person on vacation: "we have to awake at 4:00am, eat breakfast at 5:00am, goto the tour at 6:00am, arrive at the park 1 hour later, buy this, see that, go here, go there... are you writing this down!"
me: "how about, I'm on vacation, I'll be resting and meet you for lunch."
me behind the other person's back: "yikes, that person Can't see the forest through the trees."
a statement used to tell people that you are not rich. even though the literal meaning is wrong, as money comes from paper, and paper is from trees, the meaning of the statement does have some use, and is always a good statement to live by.
The smoking of an assload of pot at once. 4 blunts, 3 joints, 4 bowls, a whole pan of "adult brownies", a whole loaf of bread (toast) with cannibutter, and 15 bong rips to be exact. And its funny because Sonny Bono died skiing into a tree.
Damn, Ricky! We're HITTIN THE TREES LIKE SONNY BONO!