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1.
A phrase to discribe an extreame passion or emotion. Usually positive, but can be negitve if the case is that bad.
Often likend a volcano that is about to errupt.
"I am so fired up for tonights game"
" Hey we are going to the bar to rope some cattle and knock down some soldiers... Fire Up"!
" I just killed a monster buck with excellent brow tines and G3's, pure Muzzy power... FIRE UP"
" I am sick of my taxes going to fund stupid programs... I am fired up"
by Yankee's Rebel Son November 27, 2006
 
2.
V. To express derogatory statements to an individual; Common in Ebonics. To insult another individual deserving of it.
"Boy hell naw I'm bout to fire up yo Woopie Goldberg black lip headass!"
by Xxx117 October 16, 2013
 
3.
using drugs
we're about to fire up and get high
by tuff puff February 23, 2004