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A series of phonemes commonly uttered by English language speakers who share a common defect in English language acquisition.
When asked if she had received competent English language instruction, Alberta replied "supposably."
by texlex1961 January 30, 2009
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Fictional word that mentally retarded persons often confuse with the word "supposedly".
Ignorant Person: "Casey Anthony supposably killed her daughter Caylee."

Smart Person: "Supposably is NOT a word you fucking idiot."
by cpenn81 July 05, 2011
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It actually is a word: capable of being conjectured or imagined.

This word was popularized in an episode of Friends in the second season.
by three newtons October 01, 2004
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4
Alternative to "supposedly", used to indicate that something is obviously total bullshit, but the issue is too stupid to argue about.
"John is late for work because supposably his car blew up again this morning."

"Kate showed up to work at noon the day after St. Patrick's Day because supposably her dog turned the stove on and set her house on fire."

"My doctor says I have the flu, but my cousin's girlfriend Moonbeam says my chakras are unbalanced and I need my body energy fields smoothed out by a shaman, supposably."
by MPphoenix March 25, 2013
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