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1.
Used in the American South when addressing or referring to one's grandmother. It is the counterpart to Papaw.
I'm going down to Dixie to visit my Mamaw.
by cfisher October 30, 2009
 
2.
Usually hillbilly or southern talk for grandma. Many times this word is used in the same context as "Meemaw" "Mammy" and "Ma."
"See ya later MAMAW!"
"Great 'tater salad, MAMAW!"
by Kylaina! May 25, 2006
 
3.
Mary's kick-ass grandma who is extremely quality and more amazing than your grandma.
Kid 1: Wow, you're grandma is so cool!

Kid 2: I bet she's not as cool as Mamaw!
by Whats butter December 22, 2010