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1.
A male who acts repetitively like a small child or infant
A maby will refuse to admit wrong doing, or are unable to handle confrontation.
by Dr. Muerto de Gato August 30, 2010
 
2.
When a woman's pregnancy has not yet been confirmed by a doctor the potential baby is referred to as a "maybe baby" or maby for short. Maby may be used up until the birth of the baby in order to avoid jinxing the pregnancy.
Dear, would you want to find out the sex of our maby?
by Appreesh May 26, 2014
 
3.
Like rabies, but you catch it from wild and rabid monkies.
"OMG! Get away from that monkey. It has mabies! Maybe that is why we called it Connie? That and the fact that it has moobs!"
by Cornflakes.For.Connie May 31, 2009