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1.
a mixture of maybe, perhaps, and possibly. Can even be shortened into "mayhaps". A true Jellyism.
Mayhapsibly she had other plans.
by JellyBean Madison March 31, 2009
 
2.
Maybe, perhaps and possibly combined, it is to be used if you are very unsure about something. "did you find my lost phone?" "Mayhapsibly"
Matt- "did you find my lost phone?"

Kelsey- "Mayhapsibly"
by HOBJDTJZX November 17, 2009