Combination of 'hubby' and 'boo'.
Girlfriends usually call their boyfriends hubbyboo when they really love them because it is more special than just 'hubby' or 'babyboo'.
Allyson Choi: Hey hubbyboo, I love you so much! Please marry me.
Justin Liu: I love you too. Let's marry. Don't ever leave for college please.
by HellokittyPrincess October 4, 2010
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