To think clearly.
To think without confusion or interruption.
To assemble one's thought in the order they had intended to.
"I just can't seem to think straight with those buzzing fluorescent lights around."
by KarmaLog August 2, 2018
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Joe and Bob are watching porn.
Bob: Wow, I'd totally do that chick. And those red heels of hers, wow, she just looks... last season.
Therefor, Joe is NOT thinking straight.
by Frankie made us do it July 11, 2008
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