Your internal fuck you energy. The level of frustration where you have to yell FUCK YOU!
She was really pissing me off, my fenergy level was through the roof.

I had a sweet day today. My fenergy level is nonexistent
by Big D Money September 8, 2007
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The energy required to boost in My Sims Racing, for the Wii. Discovered by Dr. F, hence the name.
I lost the race because I didn't gather enough Fenergy!
by BoneYard1985 August 26, 2009
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Friend #1: bro, are you tired?
Friend #2: yeah bro, but i need to do well in this tournament. I need some fenergy!
by spotdoggy May 1, 2016
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