GR translation: he just isn’t out-of-the-tree about anything

[Mike Jing]

V367.30-41, P373.24-35   “Fine for you folks.” The girls are laughing.
Grandiose Slothrop limps along after everybody, a network of clear
interweaving ripples now like rain all through his vision, hands
turning to stone, out of the Tiergarten, past shellstruck lime and
chestnut trees, into the streets, or what is serving for them. Patrols
of all nations keep coming by, and this mindless quartet have to hit
the dirt often, trying not to laugh too much. Slothrop’s sox are
sodden with dew. Tanks manoeuvre in the street, chewing parallel
ridges of asphalt and stonedust. Trolls and dryads play in the open
spaces. They were blasted back in May out of bridges, out of trees
into liberation, and are now long citified. “Oh, that drip,” say the
subdeb trolls about those who are not as hep, “he just isn’t
out-of-thetree about anything.”

What does "out-of-the-tree" mean here?
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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l