Probably a bastardization of smart as a whip, meaning unusually intelligent or quick witted.
Often changed for comic effect by substituting 'whip' for an object with no edges.
"Although Arthur looks like a clueless dork, he's as sharp as a whip and completely in control."
"As sharp as chewed gum, more like!"
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Means βWicked Smart, Possesses A High IQ, Clever, Witty.β
For example, Seanβs βSharp As A Whip.β How did he remember all those events during the Attila the Hun?
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