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1.
(buh-stou-us)
adjective

1. Characterized by large breasts on a woman that are conducive to a woman's sex appeal: normally within the C-DD range.

2. A person given to or loving a woman's bosom; a person who adores breasts, especially when motorboating is an option.
Troy: You're so bustuous! I want to motorboat dem titties!
by Big ol' tig ol' bitties July 06, 2011