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1. Something big, hairy, and scary. (No, dude, not your penis...I said big :-) ) that can ACTUALLY happen to you, as opposed to an irrational fear.
2. Something not physically scary, but mentally terrifying yet very real...like an "aw, shit" moment.
Examples of rational fears:
That 90 pound Rottweiler that's about to latch onto your ass like it was a big, meaty, steak.

That 15-year old girl's father after he found out you were studying anatomy instead of geometry.

Worrying that you're gonna flunk geometry because you were studying anatomy instead of geometry.
by StevieTheOldFrigginFart August 12, 2016
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