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1.
Filipino origins- Tagalog word for "good".
Pinay 1: Kamusta? (Greeting, like "Hi how are you?")
Pinay 2: Mabuti! (Good - as in I'm doing well)
by Pinay Nanay January 06, 2005
 
2.
A claim to possession of one's lover's backside.
"Her buti may be big, but it's mabuti!"
by Manola Blablablanik July 02, 2006