A person who emitts a great aura of coolness.

Sometimes "funking" may be used to emphasise the coolness.
"What a funking coolster you are!"
by Greg the coolster November 11, 2006
When you jerk your homie in subzero temperatures
In Alaska, my man Calvin gave me a coolster
by Joe Ivy June 13, 2019
When someone has taken being part of the hipster crowd to a new level; best used in sarcasam or jest behind someone's back.
Wow, Jane just got a fullet and is going to the bright eyes concert tonight in williamsburg; she's really fucking coolster.
by jellygirl August 4, 2008