An extension of the term 'to dip' as in 'to leave', named for the sauropods of the genus Diplodoci of the Late Jurassic Period. Colloquially, diplodocus refers to a situation where the term 'dip' doesn't fully represent the necessary dipping required to bounce properly.
A council that is called among the people that are to to make important decisions on certain matters...when stoned. Where to eat, the question of standing up, and the discussion of further bowls to be packed are all typical topics discussed when a high council is called.
Wyatt - "Fuck dawg! Where we going to go?! We need food!"
Trevor - "I think it's about time we called a high council and table a verdict"