1- Some retarded moron that can't think enough to foresee things before they happen and therefore gets owned.

2- A reckless dude that doesn't give a flying fuck about nothing, to a point where he'll do anything stupid or suicidal without giving a fuck about the consequences.
-Straight Fool #1: "Yo dude, i'll gamble all my money cause i know i'm gonna win"
-Some random normal dude #1: "You're a Straight Fool..."

Straight Fool #2: "Yo, i need cash bro... Fuck it, i'll just rob a bank"
by Straight-Fool June 16, 2013
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When one apologises to another, typically one of African-American origin, and promises to either 1. change what they did, or 2. not do what they did again, the second person would use this phrase to make sure the first understands that he doesn't have power.
"I'm sorry sir, I won't shag your wife again."
"Damn straight fool!"
by Riyontakesnoshit May 12, 2016
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