Budder is a concentrated form of THC, the main psychoactive chemical in cannabis.
Budder is reported as being anywhere between 82% and 100% THC, making it several times more potent than the buds of the cannabis plant that are usually consumed (5% - 15%). 1 Hit of Budder is supposedly equal to 1 - 2 full cannabis joints.
The effects of budder are both fast-acting and long-lasting. Initially, the user will experience a sharp increase in body temperature and heart rate.
http://en.wikipedia.org/wiki/Budder

Maybe, higher THC-count Bud has the same effect as "nearly" pure THC.

Cannabis cofactor compounds have also been linked to lowering body temperature
http://en.wikipedia.org/wiki/Health_...ts_of_cannabis