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A class usually only offered at college that deals with the analysis and appraisal of arguments. There are different systems of logic for different uses, including syllogistic logic (an ancient form of logic dealing with categories), propositional logic (dealing with statements dependence on each other), quantificational logic (a sort of combination of syllogistic and propositional), modal logic (dealing with necessity and possibility), deontic logic and imperative logic (dealing with "can," "should," "will," etc.) and belief logic (dealing with patterns of belief). Most of these systems can be combined with each other and I'm pretty sure there's Wikipedia articles about all of them if you want to know more. Some classes will also cover formalized ethics (building an ethical theory with these previous systems), metalogic (the study of the logical systems themselves) and various forms of reasoning and argumentation.

It is sometimes described as math without numbers, because you learn various formulas to calculate whether or not a statement is true or false in a particular context, but the only numbers you ever see are 0 for false and 1 for true. It is also possibly the worst college course about having people bitch about how hard it is when in reality it's one of the easiest courses you can take.
Imagine a kid with Down's Syndrome handing you a piece of paper with various statements relating to the same thing on it and asking you if they make sense together. If you could handle this, you can handle a logic course. If not, you probably need to take a logic course.
by eyehatemeyeself March 19, 2010
The idea of using simple steps to overcome obstacles, problems, situations; something a wise and intelligent person uses to avoid making things assumed or implied; knowing the correct thing over the fastest and easiest thing
Halo Forge game; March the 31st, 2013

P1: Why did you place all the spawns there? And that Coliseum Wall there?
P2: Sorry!
P1: You are stupid
P2: Bitch! Not knowing one thing does not make me stupid. You know I made it through 8 years of college.
P1: Damn. You're right. I should use logic.

P2 was very intelligent, and P1 forgot not knowing one damn thing does not make you stupid; he forgot to use logic!
by Anti-Everything You Say March 31, 2013
n. loooogic, looooogically; "logic" with a drawn-out O. An annoyance term to be used when magic ("Maaagic") is getting old or when you want to surprise someone by NOT saying "maaagic".
1) "How did you get up on the roof without a ladder?! You didn't magically poof up there, did you?"


2) "Look, look, I know you're going to tell me the answer is 'maaaagic', but seriously, what did you do to get that job?"

by Squiddy Attack January 19, 2009
Logic is the study of the methods and principles used to distinguish good reason from bad reason. Unfortunately it seems to escape most people now a days as they rely on rumors from cnn, emotion and passion.
Me: "without Logic there is no reason. Without reason there is no rationality. Without rationality there is nothing but destruction"

Adolph Hitler (mien Komph) "Propaganda should use very little logic and more emotion and passion to fool the people. Masses are easily fooled by emotion and passion. Thus the more people you are targeting the less logic your propaganda should use" (paraphrased to save space)
by Arcy77 May 01, 2010
Something that the general population of good ole 'murica lacks.
85% of americans believe in an all-knowing invisible man in the sky. logic ftw.
by AkiraKurosawa September 02, 2011
the answer and reason to everything
Friend 1:... and then the my character died. Like, seriously, I got shot in the foot!
Friend 2: Cause logic, duh.
by epiclogic October 08, 2013
The fear of Chuck Norris
I have logic.
by Logicgyfcknggr November 08, 2013