Applesaucin' is slang for using the valid argument form "Modus ponens," sometimes called "affirming the antecedent."

Origin:

"We can clearly see the validity of Norcross’s argument as he correctly employs the logical device of affirming the antecedent (or as we call it in the streets: applesaucin’)."
"He's just applesaucin', but his first premise is false."

"Applesauce all you want, but your shit's still unsound."
by robologic November 29, 2011
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